I do not see how you are min/maxing DPS w/o a prot warrior in raid.
I mean if you are that hardcore to care about the few thousand DPS at the start of a fight, what happened with your logic when you've made a raid w/o a prot warrior in it?
EDIT: And at the moment that "DPS loss" over the raid is probably comparable to a DPS proccing his trinkets late, or the latency of 3-4 ppl making them a tad slower or 1-2 casters moving 1-2 yards further from a "fire". If you wanted to really see the difference on a dps meter it's so small you couldn't, not in ICC anyways with a 25% buff and neither in RS. You guys got a very good theoretical point however it's not really significant practically.