I think Hayward. I think we need him starting rather than off the bench because we need his confidence to get back to an appropriate level for him to start playing close to all-star basketball again. As for the concerns about him getting beat up by opposing PFs, I think that's ok for a few minutes before subs come in. I see a rotation like:
1st Quarter
12:00 - Start with Kemba/Jaylen/Jayson/Hayward/Kanter
7:00 - Grant Williams subs into PF spot for Hayward; Smart subs in for Jaylen; RWIII for Kanter (Kemba/Smart/Tatum/GW/RWIII)
2:00 - Hayward subs in for Tatum; Edwards in for Kemba; Theis for GW (Edwards/Smart/Hayward/Theis/RWIII)
2nd Quarter
12:00 - Start with Edwards/Smart/Hayward/Theis/Kanter
9:00 - Kemba subs in for Edwards; Jaylen for Smart (Kemba/Jaylen/Hayward/Theis/Kanter)
5:00 - Tatum subs in for Hayward; GW for Theis; RWIII for Kanter (Kemba/Jaylen/Tatum/GW/RWIII)
2:00 - Smart subs in for GW (Kemba/Smart/Jaylen/Tatum/RWIII)
Its not perfect (a long stretch for Theis in there I notice), but its more to generally show that we can start small at PF while not being small all game long. If that is loosely repeated in quarters 3 and 4, then that gives us:
Kemba 38 min (too high)
Jaylen 28 min
Tatum 30 min
Hayward 28 min
Kanter 24 min
Smart 24 min (a little too low, he can come in a bit earlier in some of those subs, take some of Kemba's minutes, and will play more in 4th Q)
RWIII 24 min
GW 16 min
Theis 18 min
Edwards 10 min
Under this idea, we'd only have 14 minutes a game where one of GW/Theis is not our PF, both guys who I think have the size to play the position well.