I know this is quite late in the life of this thread; however, I just wanted to throw it out there. I've seen many of these start said-bench-player in place of said-starter. The only problem of course is that the starters play more minutes than the bench players, so if we were to go directly with two units of players, doing a Marquis for Pierce swap would mean that PP would get far fewer minutes per game, which I don't think anyone would want.
Thus, in such a scenario, Pierce would have to play 15 or so minutes a game with the starters anyway...which would kinda be like what would happen if he was starting in the first place.
I think the better solution for people to be posting is what bench combinations Doc should be trying to work with. Maybe the better solution would be to have Marquis the first guy off the bench for PP, then let him get some run with the starters. Then bring PP back early and let him get some time with the bench.