I do not see Sheed coming for Perkins.
Fouls not an issue KG should be the first one on the bench. Sheed should be coming for him.
BBD should be backing up Perk when he picks up his 2nd or in the regular rotation.
The other team's bigs plays a factor in this obviously, but this is what makes sense to me.
I agree that will likely be the order that the players come in to the game. But I think this just shows how pointless it is to argue over who is backing up KG and who is backing up Perkins.
The C's have 4 rotation big men, and all of them are somewhat interchangable, and can play next to any other of the 4, depending on the matchups.
The NBA is not about PG, SG, SF, PF, C anymore. It is about maximizing mismatches. Sometimes you will have a SF playing PF, and a PF playing C. Sometimes you will have a SG playing PG, or a C playing PF. This team has a lot of versatility, and they will mix and match to give themselves the best chance to win.