We were discussing this in context of a fire setup though. All you said is correct, but you disregard the fact that bringing f.e. Sniper Joan over Sniper Mordred will allow you to bring Ares over Raguel and since all you need to do is burn those 2m HP within those 7 turns, the nuking + burst potential of Ares just completely outclass Raguels. This is the reason Joan beats Mordred in such scenarios imo: He does 2 jobs at once. Handling OD and brings the A frame Atk down.
Ofc BP has a lot of uses, the weaker you are, the more often you need it and especially Mordred is still the King of off-ele no matter what. I just don't like disregarding the biggest strength fire has (nuking potential to bypass the difficult parts).
Or let samdan try both and tell us his thoughts.