If Ronin is Hawkeye I can't see him being anti-registration. Hawkeye was killed by one of his friends...the Scarlet Witch. A super powerful mutant. She also killed Scott Lang. I just think Clint would become an uber SHIELD agent before a renegade Avenger. (Renegade Avengers coming this fall! it sounds like a good title)
I guess this was more about Cap vs. Iron Man. And I didn't even realize some of the reasons Clint hated Tony.
Was Cap at Bobbi's funeral? Stark did always bankroll Clint though.