Tier lists don't exactly need to provide much context, maybe a small comment for each tier but in general, you're not going to see an explanation for every unit. Many are often made with the assumption the ones looking at it understands how the game, characters and mechanics work. You can find a tier list for almost any fighting game these days and many browser/mobile games in a similar fashion.
Here's an example of a Granblue Fantasy one in which a KH one would work in a similar fashion as KH started off as a clone of the game.
https://docs.google.com/spreadsheets...gid=1700307290