Thanks for you comment :)

1- though i agree with you about the early power of the Greater Glyph of Magic Resist, you will lose its power mid/late game. Yeah you can build MR via items but, you need to build first utility for your team. That is the way i see it (at least).

2- finally someone who gave me a good reason to get Doran's Shield. But still you will be unable to "farm" gold for the ~10 first waves (each wave having 6 minions, 60 minions +3~5 from the siege ones you got 65 minions) losing 200 gold. Let's say you had to go back sooner than the usual, you have money for what? 2 Stealth Ward and ~3 Health Potion or maybe even less because you have only 1 Health Potion to heal you fast.

Greater Glyph of Magic Resist might be helpful in most bot lane matchups like Annie. Besides, I wouldn't select Perseverance anymore, not so sure but the nerf was hard.
I play Thresh myself (not so successful anymore since the beginning of Season 4) and I would say Doran's Shield is still the way to go and you general start option due to the improved trading potential and you can pok without being punished as hard.

I have made the changes in the guide and added the adc matchup section plus the more complete support matchup. If you guys can give me any feedback about that it'll be really good. Thanks! :)

Thanks for your comment man and yes the point is to always improve!!

1- yeah i totaly agreed with you and i tested flat armor seals and it's amazing. I'm going to update that.

2- Like i said in the last comment this will delay your most important items, such as Ancient Coin or Sightstone. Well it helps you to not get engaged, however LeBlanc will always focus your adc/apc not the support.

3- Second Wind to be used in it's full potential you need to be at 25% or less health, so this 3 more points in defensive deny you some good masteries in utility such as Scavenger . And totaly agreed about the Enchanted Armor .

4- yeah nice ideia i didn't though of that.

5- and what do you mean about ''to code a little more''?

Ok, so I'll only point out the things I disagree with (because this is what to do to improve, right?) :

- Runes : Please take flat armour seals. Runes are made to improve your early game, especially for supports : you will get armour thanks to items if needed, and since you're facing an AD carry that does physical damage, flat arm seals are mandatory.
For glyphs, I use a mix between flat and scaling because the other support generally does magic damage. But it's up to you.
For quintessences : I feel like gold quints aren't worth taking. I'd rather go for health quints. Since his AA range was nerfed to 450, I'm not sure is AD quints are good anymore, but I guess they're still ok. I've played him with that 450 range and I still can harass with autos, but not as much as before, and it although depends of the matchup, of course.

-Items : Doran's Shield start. As Thresh, you want to trade => Doran's Shield for all those nice stats it gives. Then I agree with your items but for the case you describe with LeBlanc, I'd rather go for a Banshee's Veil which helps you not to get engaged when it's up.

-Masteries : I don't know if Perseverance is worth if you don't need Second Wind since it's only 1% of missing health.. I prefer 0/13/17 or 0/21/9 setup. Between Recovery and Enchanted Armor , it's a matter of taste since both of them aren't giving a lot but I prefer the small health regen for laning. +5% of bonus resists aren't a lot to me and you won't benefit from it before mid-late game.

And lastly, for your matchups section : I think that Thresh is a good support for any ADc. I'd prefer to see what to do against the other ADc.

You may want to code it a little more (there are guides on this site that will help you to). Other than that, the guide is fine :)

Thanks for your comment man really appreciated!!

1- Well in my point of view, if you use the ad runes you will still have that damage from early in the game (this helps to secure kills or to do some extra damage). Besides to buy an ad item early in the game can delay the buy from your other items (again it's my opinion).

2- When i first did that masteries page i though about the Enchanted Armor . However, even if you have 200 armor (which is fairly easy as Thresh) the bonus this will give to you will be like 10 extra armor. This being said with the Recovery synergizes really well with Perseverance to give you a better sustain in the lane (since you got none)

3- yeah i'll test that xD~

4- thanks for the ideia =DD

5- agreed but if the enemy team got (for example) a Zed mid and a Dr. Mundo top, i would run Exhaust, because mundo can be dealt with via Executioner's Calling or Morellonomicon.

6- if you are winning you should focus on offensive wards so you can make jungle ambushes. But if the enemy have baron, for example, you should put more defensive wards because they are more likely to wander on your jungle or to push. Hence, the defensive ones are paths normally taken by the enemy team when they are roaming. The ''flip the map'' it's more like to switch the wards position so the offensive ones will be in the blue team jungle since purple side is a mirror of the blue side. Hope that this explains it.

7- agreed 100%. I'll work on that. Probably tomorrow it will be there.

About the last part Sona has 9 armor at level 1 xDD. The only difference being that she has a far better sustain than Thresh. But i'll change the runes you have a really good point xD~. And thanks again for your comment man, this feedback really help me out to make a better guide even more because this is my first one xD~.

-Taking Attack damage runes isnt recommended. I personally think that, since Thresh's AA range was reduced to 450 instead of 475, its better to take defense runes and buy an early damage item to enhance your harass. Then, when laning face is over, sell it

-Maybe you would like to take Enchanted Armor with all of those defense items?

-Since in season four or s4 the support role has been "buffed", you should know that there are really better ways to earn gold than having those runes. If you run gold income runes, maybe your weak early armor wont be as good as if you went with armor runes.

-Matchups section. Those support are all hard, except from a noob Soraka and Blitzcrank. Separate counters from easy lanes in this case

- Exhaust isn't just for making your enemies slow. Well yes, but if the enemy team has unreal sustain such as Dr. Mundo but they have really good assasins like Akali or Zed then you are in a sticky situation. Remember, the best use of exhaust is for keeping your enemies off your carry.

-In your map, there are wards that are defensive that don't exist in the offensive warding. If you wanted to flip the map, there would be less defensive wards and more offensive ones. BTW, this is a question from my own, if you are winning the game, you should put wards as offense or still ward defensevely? Vice-versa if you are losing

-More stuff about matchups. You should REALLY include more of them. Like a Alistar, Morgana, Janna matchup. There are lots of more supports, obviously, like Taric, Karma, Nidalee, Zilean or Zyra. Lots of content to add there.

I don't like those runes, but im not a Thresh player either. In my opinion, you take more attack damage runes than armor ones, and as you said, Thresh has really low early armor. Maybe you should search an answer in changing those runes. Apart from that, I don´t think that this is a bad guide, just work on it and it will be fine
Good luck and see you later!