why would karebu risk his life? last time he had no way to leave wano, but now he can hide in any ship, and like he is sure that he can sneak in and give luffy food in the presence of a admiral and goroshit, and its so obvious, and oda usually dont do the obvious Ig. and kizaru knows that luffy dont want to kill them, and for whatever reason kizaru cannot and willnot go against gorosei himself, I mean kizaru would have already killed vegapunk and all if it wasn't for luffy, kizaru will follow orders, but doing something like giving luffy food is a little do able for kizaru, while straight up going against gorosei is not.