None of that actually says anything. Leon's opinion means diddly...again, professional spy who is likely trained to manipulate people's feelings. And just because Ada feels giving the Master Plagas sample to her organization isn't evil doesn't mean it isn't - to invoke Godwin's, most nazis thought they were doing the right thing. Since we have no idea what they wanted it for and if she knows what it is (as far as I know, we know neither)
Ada's report also doesn't really say much...about the best you can say is she chose Luis Sera because of his humanity. That doesn't really swing her good or evil. It could mean she thinks he'll be easier to manipulate, although it probably doesn't.