So Matt stills had super senses but wants to work by the law so he doesn't become Daredevil, at least until after Frank Castle arrives on the scene as the Punisher. Maybe Nelson & Murdock still take his case because Matt realizes something is off, maybe not. But he does see how the system failed Frank (even if he hates Frank's methods), so he decides to start fighting too.

Maybe Frank is in prison when he starts, maybe Matt doesn't start until he escapes, but Frank catches him beating the man in the train yard and wonders what the hell this man in black is doing beating up some poor guy. . Does he recognize Matt? Does Matt explain his powers and offer to help Frank (maybe they make a deal about who lives and dies)?

Do they get along better or worse since Frank was the one to start the vigilante trend?