Hmm, yeah I'm actually using the same mentality atm. But the only thing that made me rethink it a bit is whether already having the character recruited affects my chances of drawing them in their respective treasure.

Hmm, well yeah it will be much easier to 4 star them or 5 star them. I wish konan wasn't in the seal treasure but was in the tendo treasure instead :/ The only ninja I want from the seal treasure really are konan and tsunade (itachi and kisame are normal drops in the kage after all)