I honestly don't think so. Listen, we took the Miami Heat, the best team the eastern conference has to offer to game 7 of the eastern conference finals. We did all this with an incomplete team, and a hurting Ray Allen and Paul Pierce. Imagine how we would do if we had a bench? We literally had NO bench, at all, there were spot contributions here and there but they big 4 had no help.
If they are able to get KG signed, and maybe Ray (not sure about this one) and add some younger, but proven talent, this team can be right back in this position again.