Btw, this team DOES have chemistry problems on the court, but that's because we're trying to incorporate too many guys.
This team would have struggled this season no matter what star was in Kyrie's role this season, because you're asking 7 other guys to flourish in minimized roles. I don't care if it was Steph Curry in there this season... Steph (like Kyrie) would be individually spectacular, but the rest of the team would still suck, because you have Horford and Tatum out there while also Brown, Morris, Smart, Rozier and Hayward are all gunning for big offensive roles.
It's not a Kyrie problem. It's a too many guys problem.
I think a big piece of the chemistry problem is too many guys with uncertain futures.
Not just the young guys, but seemingly everybody's status is uncertain:
* Kyrie is a free agent who might decide to leave
* Tatum, Brown, Smart, Ojeleye, Yabusele, Williams - some combination of these guys will be moved in an Anthony Davis trade, and everybody knows it.
* Morris, Rozier, Theis - all free agents, and Morris and Rozier aren't expected to return, and the team might not be able to afford Theis either.
* Hayward, while he has a huge contract that nobody would trade for, I bet in the back of his mind he's worried he's going to get traded. "I haven't produced in 2 years, the teams going to try to unload me."
* Horford and Baynes have player options. You think it's in the back of their mind that they're going to opt in in June only for Danny to trade them in July?
I think when you look around that locker room, 90% of the guys have serious doubts that they will be back next year, and 100% of the guys have no idea who their teammates will be next year. I think this is part of what's leading to chemistry problems.
Compare that to a team like Toronto, Kawhi's status is up in the air, but most of the rest of the team probably thinks they'll be back. MIL, IND, and PHI all have a ton soon-to-be free agents, but their superstars are all in place, and most of the guys with expiring contracts know their teams will be trying to retain them. I think there's a lot less uncertainty in those locker rooms.