This is a coherent strategy but it relies on Kumagawa not deleting Aizen's ability to use Kidou, which he's more than capable of doing. Also, if Kumagawa chooses to use Bookmaker as his opening move and rely on his ability to self-resurrect then a massive amount of Aizen's abilities get sealed (rather than erased) and then Kumagawa gets back up again.
Ambiguous partly due to the nature of how his powers manifest, he can just think and stuff happens, and the aforementioned ability to erase the time it takes himself to do thing to get truly instant attacks.
Without specifically name checking his ability to make himself instant, he's rammed giant screws through the heads of 30 odd people without appear to move and in such a manner that he doesn't appear to move and then undone the action so quickly that the people who were stabbed don't even believe it was real. He's blitzed entire groups of metahuman opponents and nailed them to the walls, floor and ceiling apparently instantly. He's also consistently able to keep pace with Medaka who is pretty high end multimach herself.
Is he as fast Aizen? Outside of All Fiction gimmicks, probably not, but he only needs to think and Aizen loses something incredibly important be it his zanpaktou or his kidou abilities. Or his ability to walk or something physical.
I picked for broken-ness in this tournament. ^_^