Semi is too versatile. He'll find minutes.
Where, though?
Say the starters each get 30 minutes, which is a fair guess considering these were their averages last season:
Irving 32.2
Horford 31.6
Brown 30.7
Tatum 30.5
It would leave 90 minutes for the following players (last season's MPG in parentheses):
Smart (29.9)
Rozier (25.9)
Morris (26.8 )
Baynes (18.3)
Theis (14.9)
Semi (15.8 )
Wanamaker (N/A)
Now let's say Smart goes down to 25, Rozier to 20, Morris to 20, and Baynes to 15, which I don't think Smart or Rozier will be that low, but let's say they are for the sake of argument. That would now leave 10 total minutes for Theis, Semi, and Wanamaker.
So, yes, this minutes crunch is going to be real and barring another season of injury issues, Semi will be on the outside looking in of the rotation. You're right, though, he may not have his MPG impacted too much because he'll see a lot of DNP-CD's, but his total minutes (last season he played 1150 minutes) will be
greatly reduced.
That's why I think he'll get some action in Maine, but they'll be calculated stints based on scheduling. For example, let's say we're off a few days he might shuttle back and forth between a C's practice, a Red Claw game, and then back to the C's to play a situational/non-rotation player role.
The only other way, besides injury, he could land in the rotation is if we consolidate via trade.