The difficulty that Green presented for the Heat last year was that we put him on the floor with Pierce against them. That left Lebron, their best defender, with the quandary of who to guard.
That forced them to use Battier more with the main unit (i.e. on the floor with Lebron), which hurt their offense.
To their credit, Battier did make a great defensive play in the end on Green - but that was razor thin from being a foul.
This year, I would not be surprised to see us put Green and Crash on the floor together against the Heat.
You have to force Lebron to commit to someone.