This is how I feel about it. In the old street fighter 2, the version with Akuma playable he is a very good character. He is at the top of the tier list, he is the only character in the game in S tier. He is also the only character in the game with 0 bad matchups, and 0 even matchups. Every single matchup he has is in his favor. The other top tier characters in A tier have a bad matchups, or at least a few even matchups, Akuma is the only character that beats every single other character. When playing Street Fighter 2 competitively in tournaments, they ban Akuma because they don't see a reason why there should be one character that is playable that dominates the whole cast. Yeah Akuma is beatable, but it is still not fair to have one character in the game that has an advantage over everyone else in competitive play.
Now lets talk about Super Smash Bros. Brawl. They have a similar situation in this game. There is only one character in S tier, Meta Knight, who is believed to have 0 bad matchups, and 0 even matchups, he wins every single matchup in the game vs every other character. In Brawl competitive play, they ban Meta Knight for his advantages over everyone else, just the same thing they do to Akuma.
Now on to MK9....... I would say we have the same problem again. Kabal is the only S tier character in the game, he is clearly above everyone else, he has 0 bad matchups and 0 even matchups. The rest of the top 5 characters all have bad matchups, and alot of even matchups as well. Kabal is literally the only character in the game that has advantage over every other character. He is the equivalent to Akuma in Street Fighter 2 and Meta Knight in Super Smash Bros Brawl. In my opinion he should be banned, there is no reason why there should be one character that is viable competitively and literally has ZERO bad matchups and ZERO even matchups. Don't give me that BS that Kung Lao goes even with Kabal because he's far from it I think.
Now LBSH, there are top players in this community that picked up Kabal only and solely because he is the best character in the game. I don't think there is one single person in the community we can name that has been using Kabal since day 1, everyone picked up this character because he is the best. If Kabal was only say top 10 instead of top 1, I don't think we would even see maybe two Kabals at the most in any tournament. Ban him or patch him, one of the two. And obviously we are not getting a patch any time soon....... so yeah lol