At the risk of hijacking the thread for a moot point, I don't buy any of the above reasons why Perk never averaged 30 minutes.
He didn't play end of games due to FT shooting, fine. No reason not to play 36 some other time.
Who were those backups? Posey wasn't a C, and Powe wasn't a C either, and KG played limited minutes at the 5 (BBD guarded bigs in the post).
And I don't really think it was fouls most of the time, either. His highest PF avg is 3.3, suggesting that wasn't the reason for limited PT.
Glad to have the pick for sure, though. One thing Danny has been smart about is being protective of picks and not trading them away easily.
Perkins played a large majority of the minutes with the starters and Doc used to use a lot of different lineups for small minutes. Posey was typically first off the bench for Perk, and finished a lot of games for him especially come playoff time. In 07 it was him, Brown, Davis, and Powe did play some time at C next to Posey. The next year it was a lot more Baby, and KG still played C next to Powe and a significant amount next to Scals. Then it was all Sheed and last year it was a lot of Baby again.
So this year is the first time KG has really played C in two years, but he did play it a decent amount back in the day. As for the other guys that backed up Perk, I can't really complain about any of them being less than "competent" unless you count the limited Semih and Mikki Moore minutes (I did complain about Baby but only after the trade when he was JO and Krstic's backup).
As for your other comments, I guess Doc didn't think it was reasonable to play Perk for a straight 36 out of the first 40 minutes. Also, the league leaders in PFs are usually around 3.5 (remember they usually only get 1 or 2 and that averages out the 4s and 5s), and it only takes 2 in the first Q to sit down. Then if he gets that 3rd when he comes back in he goes right back out and ends that game with around 20min. Unfortunately, foul trouble wasn't always a rare occurrence for Perk and other defensive players like Noah, Dwight, Chandler.