mares is an easy fight stylistically for donaire. Rigondeaux would give him problems since he's a defensive counter puncher. Moreno hasn't fought at 122 I don't think.
gary Russell still needs to step up first before I can comment. he seems to be the truth so far but he's fought nothing but bums so we need to see him against a top opponent. he leaves himself wide open at times when he's throwing combos and I've never really seen his chin tested, although I'm sure since he's been fighting weak opponents maybe he doesn't care if he's wide open. Just something I noticed in his past couple fights.
anyways I don't see the rush to move to 126 for donaire, plenty of great fights at 122. Id like to see him stay for awhile. Nishioka, Rigondeaux, Mares, hell even Poonsawat if he ever comes to america.