I just spent an entire odin fight (from the start) going all-out as a bard, hitting it, even taking damage a few times, and i got completion, 29 serpent seals and 10 gil, no mantle.

I was in a party with others who were also there from start and some only got bronze, others got nothing as well.

A bunch of people also mass dc'd halfway through

So what's the deal? It's been over half a year. Why is it so hard to get one single fight to work properly? I thought this was supposed to be fixed multiple patches ago.