Gamboa would be favourite, but I think he has a better chance than anybody would expect. Really comes down to how big the size difference is. I'm not saying he loses to the 3 guys at 122 but they're awkward style matches and he wouldn't look good against any of them.
I agree and have $100 (or any part of it) to put on Rigondeaux vs Donaire right now. Fight must take place before Sept 2014; if either fighter loses before, the guy backing that fighter can withdraw the bet. If either of them is a top 5 p4p guy, it's Rigondeaux and not Donaire.
I wouldn't be shocked, I mean Gamboa is fairly wild and Donaire is a sharpshooter and great counter puncher if nothing else. But despite looking HUGE at flyweight, I don't think Donaire is another Pacquiao. He doesn't look big at 122. At 126 I reckon he'll be undersized unless he can fill out considerably, and I see Gamboa just walking him down and throwing him a beating.