... my base assumption has been that Crowder would start at the 4 with Hayward on the team.
I have my doubts. To be sure, Stevens has shown a willingness to play Crowder at swing (to use his terminology), but not as a starter. He's also aware that the results are not stellar - though he points out that the sample size is small.
Point taken, Brad; but that's because YOU didn't choose that lineup except in special circumstances. The Chicago series is a marked exception, though to his credit Stevens didn't stay with it in the second round when Washington was overwhelming Boston with their size.
So it's not that Brad doesn't believe in small lineups, or even in Crowder's ability in that context. But to start the game? As the standard lineup? Unlikely.
Crowder is 6'6", so for Boston a "small lineup" was
really small; the most used group was Thomas, Bradley, Smart, Crowder, Horford (with Smart as the primary ballhandler, giving Thomas a chance to play off the ball).
One of the many ways that Jae upped his game this past season was by raising his defensive rebounding (17.3%, a career high), something Coach no doubt appreciated, given the team's struggles in that area. But as a full-time swing, that's a problem.
Is Tatum a game-changer? Maybe. At a long 6'8", he might have a future as a starting swing.
Crowder can fit on just about any team in the league as a starting wing. As a swing, he's best as a backup.
But I do think Crowder is the odd man out if Hayward comes, which is something that I haven't thought until this afternoon.
If so, it's a lot to give up. As you've noted elsewhere, Boston badly needs shot-creation; and Crowder doesn't give you a lot of that. But what he does give you is winning basketball in a lot of areas.