We have to consider in this the team is bringing in more young players via the draft. If the roster is full, there are big minute questions to begin with.
If Baynes and Smart come back, I don't think you have really any room besides to add maybe a Belinelli who knows he may not play except when shooting is needed. We will have I think Hayward playing a lot of PF, Morris and Semi at PF. Horford, Baynes, and Theis needing proper big minutes. You have to get minutes and shots for Kyrie, Hayward, Tatum, Brown, Smart, and Rozier. Yabu has showed real potential I think, particularly on defense.
The team will be stacked. You want to give young guys like Semi or Yab the chance I think. We may also draft someone who can play or even trade up for a higher pick or something.
For me I think you can always use a veteran shooter but otherwise we are pretty set.