Well, what about the Cavs? The league's laughingstock last year with constant rumors of turmoil, front office incompetence, etc. Besides LeBron, they added a bunch of guys from lottery teams like Shumpert, JR Smith, and Mozgov. Kevin Love was widely considered a quitter who was overrated and cared only about his numbers in Minnesota. Still, they went to the Finals their first season together.
Don't get me wrong, I like the idea of the Celtics valuing team culture and all that. I like to root for a team that does things the right way instead of just rooting for laundry. However, I'm fully aware that just having team chemistry doesn't guarantee anything, talent is just as or even more important.
If Ainge could trade a bunch of these so-called hard-working, smart, team-oriented non-stars for noted malcontent DeMarcus Cousins tomorrow, he would do it in an instant.
You can't just say "LeBron aside". He is that guy and you can see his influence on players all over the place. He holds them accountable and is a leader. As colincb pointed out, he basically had enough of Waiters right from the start (and for good reason) and I'm sure that sent a message to all the other young players. They also had multiple other veterans who have been around the league for a while, including Marion, Miller, James Jones, Haywood, Perkins.
The Cavs before LeBron are a good example for my argument that veterans and leadership matter because they were a mess. And coaches too. Not that I'm the biggest Blatt fan so far but he's better than what the Cavs had before.
I don't see the problem with the other players they added too. I dislike Smith quite a bit, but Shumpert was always the hardest playing guy on the Knicks and Mozgov was always a good big. I'm not saying the team has to win a ton of games. Our Celtics team just barely made the Playoffs. It's about culture, leadership, giving an honest effort, and your coach and organization.
And to the second point, I'm not saying our team is great as is or the personnel is perfect or anything. I would trade for Cousins in a second too (I think he is volatile but he's had a terrible situation to start his career and it has almost never gotten any better in Sac). But when we do that, we have a good atmosphere for him to come into where there is a focus on the right things and all that would help Cousins I think quite a bit. If he was in a better situation, like I think he would be in Boston, I think he would develop into a better player as a result of these factors.
So basically, I think the Cavs are a bit different and I'm really talking more to a rebuilding approach. I just have seen a lot of support for the 76ers approach and I think it's not the right way to go.