Revelations from Patch 2.55 [SPOILERS]

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Yda doesn't just drop a Final Heaven out of nowhere. Papalymo casted some sort of spell on her (most likely Aura) that gave her the ability to unleash an attack that would normally require the combined power of 8 people. (Also, Papalymo's Fire IIs still hit for I believe over 1k damage, which is more than an i130 BLM can say. He's more skilled at thaumaturgy than we are, if anything.)

The only time we saw Ilberd actually fight before 2.55 was I believe in 2.4's story, more specifically the instanced fight in Northern Thanalan during The Reason Roaille. And I'm pretty sure he held his own.

As for some of the other Scions, sure, there might be a trope in play...but - and you seem to want to ignore this fact despite overwhelming proof that it is fact - the Warrior of Light did not have a weapon. I can't really drop a Flare if I don't have a tool to channel aether through.