I was thinking for a bit and I think I got it. F.O.W.L. is using him to break scrooge. I bet they will thaw him out in order to make him a rival to scrooge. Rockerduck already has alot of money and F.O.W.L. could invest even more to help with this plan. Scrooge would be way too deep in trying to 1-up Rockerduck with business so He would be more focused on that instead of hunting down the relics. F.O.W.L. would then be able to get them in order to use them in their master plan to eliminate Scrooge and his family.