This has been obvious since the 2018 ECF run when Brown and Tatum played above expectations and the team roles between young, talented draft picks and the established stars like Irving and Hayward became very confused.
To win titles, I believe the Celtics need 3 main changes:
A playmaker deluxe PG to replace the line of ball-dominant, scoring guards that Ainge keeps going after. Seemed obvious to me that after 2018, the team should play to its strengths, being their wings. Irving and Kemba are a bad fit with the two J's.
Major upgrade at center with a strong defender/rebounder who can also score when needed. A physical power forward off the bench would also help our very weak interior play. Celts need a big improvement in post defense and rebounding along with getting more easy points inside. We have to work way too hard to score consistently and living by the jump shot alone ain't gonna put #18 in the rafters. I am so sick that the Lakers with that fraud Lebron have tied our titles record.
Finally, add a couple of knock-down, catch and shoot killers. Celts are not a great shooting team, very streaky collection of jump-shooters.
There is a lot to like about Brad Stevens, but in the end, I just don't see him having a firm enough hand to guide a team through the playoffs. I am not suggesting we need a screaming maniac or a task-master like Thibs who plays his guys into the ground. I just don't think Stevens is tough enough to get it done.