If the Celtics are healthy, Green is the x-factor that can take them over the top. If he finds a groove, he'll be an excellent weapon on both ends.
A top 8 of: KG, RR, PP, AB, BB, JG, JT, JS has me really excited. That is a stronger 8 than the team that lost in game 7 in Miami. This is a Celtics team that can definitely get another 50 wins.
Now the C's need a taller 2, another 5 and injury insurance. If they get this added depth I expect the C's to be right there for the #2 seed and 55 wins or so.
Other teams:
Miami is good for 60+
Chicago (even missing Rose or with an injured Rose): 55
IND (if they match Hibbert): 52
NYK: 50
ATL: 50
PHI: 45
Nets (assuming no Howard): 45