Preface: I am talking about the O5S strategy of having a warrior be the only one to go into the train for the ghost phase, use IR to kill the ghost in 2 GCDs and coming out before the party suffocates.

My question is - was it ever, at least roughly, calculated how much potency is being traded in this strat? Losing a full IR phase seems pretty big for the war and I am not entirely sure what is the exact gain in pulling the last phase a few gcds earlier from not having to kill the ghosts.