How do you do dungeons with blu mage?

[Tinibou]

afraid it's a flat % for the party whether your a party of 1 or 8 it's the same roll rng truly is a fickle thing

Yes but as long as one blue mage learns the spell everyone else will learn it.

That's why I don't understand what's the truth here. If there's such thing as "as long as one blue mage learns the spell everyone else will learn it" that means that each blue mage has the % chance to learn the skill. So it's not a % chance for the party.
Ah, my head... :'D