Go back to the missing personel of the 2008 Championship Celtics team and take a look at who's missing:
1) PJBrown (tough big)
2) TAllen (tough and energetic guard)
3) JPosey (tough energetic SF/PF)
4) LPowe (tough PF)
5) BBD (tough, clever -sometimes crazy - energetic PF)
6) KPerkins (tough growlling C)
Yes, they aren't all-stars, but those guys were the heart of the team. And exactly what we lack.
Heck, even Sam Cassell played with an attitude/swagger.