SCH starts out with the ability to cast faster than BLM, and/or much harder than BLM. As they consume strats they lose that ability, where BLM is still hitting cast time reduction cap, SCH is slower, and only nuking for slightly more. Until the BLM's MP runs out, once the SCH has no strats the BLM pulls far ahead in DPS because they cast casting at nearly twice the speed of the SCH. Thats why I said time kills SCH, because originally, it starts more powerful than BLM, but if you wait 3~7 nukes then the SCH runs out of strats, and after that point is when BLM starts pulling ahead. In a short fight, SCH will not likely run out of strats quickly enough for it to lose to BLM, but in a long fight, if the BLM can keep their MP up then the BLM will end up being the more powerful of the 2 because it is a constant and sustained power rather than 1 which relies on JAs to fuel it.