As many have said, my group has a similar looting rule where the job you bring to coil is your primary. If a piece drops for MNK, and our MNK needs it, they get it. However if it drops again, and no one has MNK as their secondary roll option, anyone in the party who has a MNK at 50 can roll on it.

We don't get a ton of useless items, most everything goes to a person who needs it and repeats wind up going to someone who equally needs it on their sub class.