By no means would I say the Celtics shouldn't win this series, but clearly the Hawks have grown as a team a bit since the start of the series.
The Hawks haven't grown as a team. They had one good game in game three. Then they left all those positive things they did in game three (ball movement, running an actual offense, didn't establish their post game, didn't shoot from the perimeter well) and threw it down the trash. They got miraculous individual performances from Joe and Josh, the Celtics folded and they got lucky and got a win.
This isn't a team that's growing. That's two completely different performances. One (game three) has promise and the other (game four) was a replica of their whole season. That's not growth, at least not growth as a team.
Atlanta has not grown as a team
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Josh Smith might have figured one or two things out, we'll have to wait and see in Game Five. He's been a lot better and much improved in picking his spots. Then again he's an inconsistent player, maybe he just reverts back to normal the rest of the way.
I'd give Al Horford some credit too on the growth scale. Did you notice at every little tussle he was the first one over to calm everyone down? That he was wrapping his arms around Zaza, keeping him away from getting involved again, and making sure his head was back in the game? He was doing this all night in games three and four whenever he thought a teammate was losing control. Beautiful to see his leadership grow and it's amazing to see how much respect his teammates have for the rookie in their responses to him.
How do individuals grow and not the team? Is that hypocritical? Because Atlanta has had good individual talent but never meshed them together succesfully enough to be a good team. They've never developed a cohesive offense for that reason. That just repeated itself in game four after a good game three (28 assists on 36 FGs, ball movement baby!, they had more turnovers than assists in game four).