Seems like you are really trying to convince yourself that Boston is a big underdog. Pierce will be fine. Allen hit 2 clutch 3's last night in the 4th quarter, he will be fine, not his normal self but he is too good not to make an impact. If Pietrus concussion was so severe that he would still be recovering, I'd doubt he'd be playing (safety rules). Miami has injury issues themselves and I'm sure some of their guys are banged up.
Do you really think that Miami's best 5 (Bron, Wade, Chalmers, Battier, Haslem) is better than Boston's best 5 (Rondo, Garnett, Allen, Pierce, Bass)? Negative. That is why Bosh is so key in my opinion. The Heat's bench is weak, Mike Miller and Joel Anthony are limited. Bron and Wade carried the Heat in a 6 game series against Indiana. I think Boston is better than the Pacers