Yeah! To speed this up, it wraps all the way back to my first point. They knew the MU cuz they experimented with their character. Experimenting with your character is key so that when something comes across, you adapt and learn it. Imagine if no one knew how to learn to edge guard ZSS, Salem probably would keep winning tournaments. The tier list is screwed up because people fail to experiment fully with their character. For example, Peach. Everyone was saying things like "ohh Peach is so bad" and "all she can do is turnip camp and dair". Then friggin Kie came along and showed us what float-dashing could really do. True, float-dashing was found way before this but then BAM! a new use for it. Now we got Kie and SlayerZ doing these crazy shenanigans with Peach, and are probably as of now better than Illmatic who was the best Peach before this.
Im sayin all that just so say that there are probably some crazy things all the characters can do that no one has figured out how to do yet. Which is another reason, there are people that are significantly better than the 2nd best, (Will, Trela, ESAM) Then there are characters that no one is really good with, like Yoshi. No one ever uses DR that much... but until one guy comes up and starts DRing all over the place similar to Peach everyone's going to be like omg, Yoshi 2 stronk! MK's, ICs wont know how to deal with it for a short amount of time, until they go experiment some more and learn to counter it.
Keep in mind, I know MK and IC's are still probably going to be the strongest characters, that part of the tier list I agree with. Its everything else I disagree with.