Coaching change was huge, especially on the defensive end and ball sharing. Certainly health and fatigue were major factors.
One thing with regard to roster changes that I don't think has been mentioned is the replacement of Kemba in the starting lineup WITH SMART. Clearly there's obvious defensive upgrades going to Smart from Kemba, but I think just as much change has occurred to our offense.
Believe it or not, Smart is much more of a traditional point guard than Kemba, and he's much less ball dominant. I think this change - in conjunction with the addition of the good passing/playmaking Horford - has allowed Tatum and Brown's playmaking to really develop, which has opened up their games so much more.
Not only that, but Smart is playing the best basketball of his career. Of course, you could say he's now playing his true position that allows him to play that way. 4 of our key starters are playing at a level they've never played before.
Smart: Just mentioned
Tatum: MVP Conversation
Timelord: DPOY consideration/Anchor of the defense
Horford: Playing at his highest level in quite a few years.
Then, you go down the bench.
Pritchard: Unconscious shooting
Grant: Best basketball of career
There's 6 guys that have all taken it up a level. I'd say that is the reason for our improvement. Notice Brown is missing. I love Jaylen, and he's playing fine and helping us win. However, I am still disappointed in his tunnel vision and lack of playmaking.