Considering Usukane is pretty much the best the best TP set for MNK, I don't see how you can be gimp with it, if you have good pieces in the other slots (Destroyers, Black Belt, Brutal etc.). Sure, with those you're less pimp, but you're farm from gimp unless you sport things like White Belt, lvl 14 DEX rings, and Spike Earrings. But in that case I have no idea how said MNK would even be able to stay in a Salvage shell long enough to even get a lvl 15 drop.
I'm just said DNC and SCH can't use Salvage sets, since that means I'll have to get other gear besides Salvage gear for it, thus I need even more sets then I currently have =/ if SCH could use Morrigan I could just walk around with that set for it (with a few extra situational pieces)