Don't look for the captains at the moment though.
Manga reading list: Bleach, Naruto, Katekyo Hitman Reborn, One Piece, Code Breaker, Gamaran, Kuroko No Basket, Fairy Tail, The World God Only Knows, Kimi No Iru Machi, Good Ending, Medaka Box, Nisekoi, D.Gray-Man, Ao No Exorcist, Freezing, Magi - Labyrinth of Magic, Soul Eater, Rosario Vampire Season II, Iris Zero, Ubell Blatt, Bloody Cross, Sun-Ken Rock, and Infinite Stratos,
why didnt Kurotsuchi just kill him >_>
"Once the threads of fate are tangled, they cannot be undone" R.I.P Kikyou
I am not perfect and I defy you to prove otherwise
Growing Old Gracefully is an Oxymoron ... Mostly Moron !
A bridge towards peace; the will of fire still endures!
Rokudaime Hokage, Rokudaime Rikudou Sennin Uzumaki Naruto
Also, it fits Mayuri's personality. He never immediatly kills anyone...he always has to tell them how they will be perfect test subjects for his experiments and what not. He did that with Ishida, the espada, and the old man bount. Ken does somewhat the samething, he always beats his opponent up, then he starts to walk away because the fight is no longer fun. The only Captains I can think of that go straight for the kill is Byakuya, maybe Toushiro, soifon, and Komamaru.