[Whewt22]

So sassy *snap snap*
He underestimates his opponents, he's sloppy. He didn't easily cut through anything, his shikai was required to cut Luppis arm, in which most likely had little if any heirro when aquated to Yammy or Nnoitra. Ryuken, Mayuri, and Soifon are all stronger than Kisuke as far as we know.

Ryuken is clearly on Isshins level in which I explained in my post. You also ranked Isshin as fourth, on pure specualation. All we know as of now, is they can both kill arrancars in one attack. Mayuri is clearly more prepared for his fights, and his shikai and bankai releases are superior to his skills as of now. Soifon has mastered hand to hand combat, shunpo, as well as flashcry, with a shikai that kills her opponent in two hits.

As I said lets try not to base our choices on speculation but facts until proven otherwise.