[SmG Battlefire]

So many examples of the Flash that he's pretty replaceable imo. Wonder Woman coincides to the whole small groups idea.
Lex could be dealt with by other means I'm sure. Gotham was a crap hole initially. So eh.......

You can't possibly say Flash is replaceable. There is only one and that is Flash.

Batman was the one who recruited Wonder Woman. He was actually the only one who even considered her to be in the Justice League.

And for Lex. Batman was the one who actually been able to convince Amanda about Lex's real purpose for Presidency. So no one else would have been able to even come close to having Amanda actually reconsider her stance against the Justice League.