I like Pritchard, he is a good player. Not a bad contract. But if we didn't play so much with an extra guard (1 big), he wouldn't be getting many minutes. I look at it this way:
Guards: White (32), Holiday (32), Pritchard (18) 82 min Total (1.7 per 48)
Wings: Tatum (35), Brown (33), Hauser (18) 86 min Total (1.8 per 48)
Bigs: Porzingis (28), Horford (26), Kornet/etc. (18) 72 min Total (1.5 per 48)
What this is saying is we play half the time with 1 big and half the time with 2 bigs and a lot with an extra guard. You can play with 1 guard and an extra wing. Most teams play closer to all the time with 2 bigs so the total minutes for bigs would be closer to 84 minutes. It would/could look something like this for the principal 9 man rotation:
White (32) Holiday (16)
Brown (34) Holiday (16)
Tatum (36) Hauser (20)
Horford (24) Tillman (16)
Porzingis (30) Kornet (16)
That ends up being about 1.8 per 48 for the bigs. Our guards are White and Holiday. We play fewer guards and more wings and bigs (relatively). It is still some 1-big play. Holiday could still start if you are worried about that, it doesn't matter if we start with a 1 big line up. Maybe next season, Tillman or Kornet is replaced in the rotation with a better player (essentially the replacement for Pritchard). Again, I like Pritchard but his minutes right now are a product of our guard heavy rotation. He is getting minutes because he is better than Kornet or Tillman. If we had a better 3rd big, that might not be the case.