[quote=@vancexentan]
Why not just steal Momo's quirk in that case? Its basically the same thing but without the side effect of having to expel that, and wait for it to harden?
[/quote]

Well, I also mentioned the maneuverability and distraction that the steam provides Kaito. And also, the expeling and hardening depending on what you're creating would take less than a second (a spear for example) so not much of a drawback  unless it is something more sophisticated. And there's also the side effect of the Berserk state.

If I were to change the quirk, I would focus more on it since his thing is pretty much, being tactical and outsmarting enemies while sane (Dr. Jekyl) and overpowering enemies with brute force and no thought while going Berserk (Mr. Hyde).