Hi, thank you for liking the guide.

For 1) I would say no, because Ekko scales well enough with Items so more resources (permanent mana+regen, ability haste) are more useful and simultaneously increase his overall DPS. Though if you prefer the precision tree options you could do that.

As for 2) Zhonyas is a great pick on Ekko since his ultimate is what allows him to dive into the enemy team and onto carrys and Zhonyas is a useful tool to prolong having your ultimate up since you can just Zhonyas instead of instantly ulting out after jumping the backline.
I would not recommend to opt for any tank items (besides Abyssal Mask at best) because AP is crucial to Ekko since he has lower base damage and higher AP scalings on his abilities after his infamous tank ekko nerfs. Building tank therefore only weaken you as Ult+Zhonyas gives you very good survivability already.

Thank you, i'm glad you like it so much (:

Thanks! You can check the Ahri match-up under "Threats" :)

My build is just one of many on Ekko; Zhonyas and Ludens are of course also really good items on Ekko aswell, so if you feel like you are more comfortable with Zhonyas as for example with Abyssal Mask, utility-wise, you can change and experiment with items and find out what you like the best.

Ay thank you for the kind words! (:

I appreciate the comment, but to be honest i don't understand the question. I mean you can take both Ignite and the new Dark Harvest...

Thank you for the comment!

So since teleport got nerfed, i think it more comes down to personal preferance.
Ignite gives you kill pressure, take it when you wanna play aggressively.
Additionally, not only you can secure kills with it but also deal with enemy healing too because it applies grievous wounds.

Teleport on the other hand gives you so many different options.
It allows you to trade much in lane, recall and teleport back to lane without missing experience and farm. You can use it to roam anywhere on the map, help teammates or teleport to a teamfight when you, for example, splitpush. Or you use it to defend or steal an objective.
It's an overall really versatile summoner spell which is why i prefer it over ignite.

Thank you for the nice feedback! :)
The Zhonyas Combo is pretty neat when you get chased, especially when you are low on health, because people will most likely gather around you to finish you off, so you can ult them right after exiting zhonyas.
But to be honest more high elo players won't always fall for this, which is why the Trick is so inconsistent.

You can combo your R in many ways. Not only for damaging, but for example also for repositioning, such as ulting back after you got knocked backed by Azir's R.
Also you can W the line between you and your ghost. Your ult is able to proc your W, so you can actually get the shield from your W when ulting, which is pretty useful in teamfights.

Really appreciate the feedback, I'm glad you liked the guide. ^^ If you have any more suggestions or questions feel free to ask :)

No Problem! (: