Aran skillbook drops/skill quests?

So, most/all of Aran's skills are earned through Cygnus like quests? Like for Brandish and Advanced Combo?

I can't speak for 3rd and 4th job, but 1st and 2nd Job build was pretty much Save SP, quest, save SP, quest, OHAY NEW SKILL, add, save SP, etc.
Combo counter at lv 13, Booster at 22, Mastery at 31, Drain at 37, Smash at 45, Rush at 54...
iirc.