I think this seasons woes can all be traced back to three basic factors. The first was Hayward, it's not his fault but he was bad especially to start the year. Having him in the starting line up forced all the young guys like Tatum, Brown Rozier to change their roles and hunt their own shots a bit. It hurt our defense a lot. He should have been coming off the bench for 15minutes a game to start the year. Then that bad start caused simmering tensions in the form of Kyries awful leadership to boil over, which only made everything worse. Suddenly nobody could trust each other on the court. And finally there was Stevens, I think more than his timeouts or philosophy his biggest failure was the ability to adapt. He was too slow to bench Hayward and Brown when they struggled, too slow to hold guys like Tatum accountable when he got mid range happy, too slow to put Brown back in once he started heating up the second half of the season, too slow alter Haywards role (yes, he's a great passer. But if you can't score you shouldn't handle the ball as much as he did), too slow each step of the way.
I think honestly one way or another we just have to pick a direction. Get Kyrie, throw some piece for Davis, thats fine. Let Kyrie go, probably lose Horford, maybe trade Hayward (if we can) and go young with Tatum and Brown as 1a and 1b options is fine too (and honestly, I might enjoy that more). Either way if there's one thing I think we learned its that when you try to both rebuild with youth and compete one way or another you usually end up doing neither properly.