japanese fighters value the wba and wbc belts more than the wbo an ibf. llok at the list of champions. yyou won't see a japanese name under the ibf and wbo banners. donaire holds an ibf belt and is a high-risk for naito so the chances of this fight actually happening are slim to none.
donaire wins the first fight by knockout, the second by mid round tko, then wins the third by decision.
Donaire will be up at 115 and fighting the best in the USA like Arce and the WBC guyand making some good money
I dont think Donaire would "easily" beat Naito. Daisuke is a solid fighter and he would be hard to knock off at home. Donaire can make a good career in the U.S, doubt he would go for this unless he got offered a fair amount of dough. It would be good for him to go to 115, Arce, Mijaries, Montiel, Darchinyan rematch are all good fights for him.