I want to believe Cap is Ronin. XD Who are you thinking Iron Man is, though?
[edit]
Right. I read it again, and Ronin can't be Cap.
Oh well. He asked Cage if the group talked that much during a fight, so he's probably someone who Cage knew. Also, he called him with 'Yo'. Imagine Cap saying that. Wheee XD
Now who the heck can that be. o.O