Thanks for the feedback, theres already extra information about that but also about other stuff in the little note pop ups next to each section and for runes they can be found in the top of the page. I still prefer to show and use CdG over LS because i often rather try to escape when im low on HP so extra damage wont really help when trying to get away and being able to kill my enemys faster when they are low is more important to me as i then get my ability resets faster.

Under basic setup (start page on edit guide) you can set it up at option "4. Champions" just add another champion or the same one if you want more options.

You will lack dps on both options, it'll be difficult to burst kiters and champs with peel and also harder to fight bruisers and tanks.

Happy to hear you say that about my Guide.
Picking Runes is mostly based on enemy champion picks and your own playstyle preference.
Both LT and HOB are working well on Yi but both also have their ups and downs.

If you have trouble deciding on which one to mainly use you should play straight 10 games in a row with the same runes and look, not on how many of those games you've won but on how many of those games you've performed better then with the other runes.

I like to run LT over HOB because HOB only really helps from the early to mid game, thats also when Yi is the weakest but it kinda forces you to do something before it becomes useless while also having an annoying bug in which the runes sometimes does not work after you use Q. LT is more consistent, scales better and makes you get more out of your damage in longer skirmishes. The game is currently going into a direction where consistency again becomes really important and better on Yi, hope that helps.

GL&HF

You go Kraken together with Rageblade in one build since those items offers you consistent damage, wether you skip Rageblade or not depends hardly on your current situation, what kind of champions you are facing and if those are ahead or not. Usually Rageblade is your best 2nd item tho since as most people tend to forgot it only costs 2600 gold which is very cheep and makes you a faster threat by having a sooner powerspike. Duskblade is only for the oneshot build when most enemy champs are squishy as you've saied, it'll let you burst them quicker and gives you some sort of survivability since you become invisible after takedowns which is more valurable than consistent damage for that build and playstyle so you go stuff like collector with duskblade instead of Rageblade. Also for your Titanic question i don't like tank or offtank playstyles on Yi, for Titanic you need some sort of tank stats to make it work but Yi scales just that good with other items and Titanic really does not offer much damagewise, so i don't see any use for it as it is right now.