So here's a no-brainer;
Two famous ex-sidekicks teaming up. Why? Who cares.
They just do.
And it is Legen.......wait for it.......Dary!
I'm pretty sure countless other blogs and forums have already put those two together, but I think it bears repeating just out of sheer awesomeness.
I mean seriously, what other two people are more perfectly suited to team up and kick ass together than these two?
Former kid sidekicks? Check.
Both used to be deader than dead and stayed that way until 10 years ago? Check.
Both have attitude problems their currently working through? Check.
Both tried to kill their respected mentors? Check.
Both either attempted or did replace their mentors at one point? Check.
Both had movies devoted to them? Check.
Both seriously fucking love them some guns? Check, check, and double check.
Sure Nightwing's the original sidekick, but its he nowhere as inclined to kill or is as mentally screwed up as Jason is(although he really should be at this point).
So, imagine whatever scenario you like, just as long as it causes these two to team up, kick ass, take names, and then go grab some beers afterwards.
They could even star in a reboot of that 80's sitcom, Perfect Strangers.