I still like Smart as our 6th man. I'd prefer trying starting a 4-some of Kyrie, Jaylen, Tatum and Horford, along with one of Baynes or Rozier, depending on matchups.
Bring the odd man out above, either T-Roz or Baynes, off the bench along with Smart, Morris and Theis. I still would carve out 10-15 minutes for Larkin, which gets easier if Rozier starts.
The way they're both playing, Rozier deserves a few starts at SG next to Kyrie because he's been arguable our best player, and Larkin's playing like a legit #2 PG.