Okay, while Saxton Hale is admittedly an awesome paragon of manliness, his tendency to fight anything that will fight and randomly attack hippies prooobably means he won't fit well or be able to interact much, as I'm seeing it personally? I mean it might work, but just as a player I'm kinda seeing some immediate personality, teamwork and character motivation conflicts XD
Also the killing. There's precedence about no killing. Especially on a team that includes someone trained and raised by Batman.