Honestly, as appealing as some of it sounds, their abilities are-- truly difficult to manage. Tyki Mikk can become intangible like Kitty, but he can also affect other things: he can reject the very atmosphere around you, creating a burning vacuum without oxygen. Road can pull you into her dreams and make you see and experience whatever she wants you to, forcing you to attack your own comrades.
Without Innocence... I don't know if there's anything that could be done to fight those abilities.
[he's not ruling out the possibility; he's listening. pinning them in place, herding them magically -- it sounds pretty appealing. he's just afraid. how could he let a friend try to fight Tyki when he could kill them in seconds and they'd be powerless to counter his attack?]