User blog comment:B214/Question and Answers 3/@comment-25222726-20140704142303/@comment-1359322-20140704142848

That's only a small reason. The main reason is because of Cao Cao, Cao Cao's True Longinus is considered to be the biggest threat to a Devil. The Devils doesn't want to lose their Maous. Even if it's Sirzechs or Ajuka, they can't fight the Jabberwocky and be unscathed, if Cao Cao chose to attack them at that condition, their deaths are certain. Well supposing if they do meet Cao Cao at a 100% healthy condition, they might still die, remember the True Longinus is one of the most powerful Holy items, just a stab of it to the heart, and the Devil is dead.