Originally Posted by
Enkidoh
Being able to equip a Job to a retainer doesn't actually make them that Job at all though, it's merely a concession to allow them to wear AF/Job-specific gear, they're still just the same class as they started as (this is why they don't even equip an actual Soul Crystal but a mere scroll with the Job icon on it, it's basically a licence to allow them to wear that gear as just a costume basically). Equipping a Job to a retainer does absolutely nothing on it's own to improving the chances of them bringing back rarer items from Ventures, it's merely the gear you equip that decides that. (After all, the GC Squadron members do not have Jobs but just ordinary classes, and they're actual adventurers and career soldiers to boot!).
Hence, once again retainers are not adventurers, they're just hired servants who you send out to find things for you. Equipping a 'Job' just allows them to wear Job gear as a uniform, they're not actually using that Job at all (so your 'WHM' retainer for instance is not actually a WHM at all in any way).