Donaire also give his best during his first fight with Inoue. He did succeed against Gaballo and the other guy because he does have the goal to get another chance of rematch with Inoue and that's enough of a motivation.
What is his goal after Inoue 2 would motivate him more but if this is his last due to his age he might not be able to make it again. Inoue is fast and determined to win it all. He isn't called Monster if he isn't a monster.
But not the best as he could unlike on his prime years. Inoue is seems like a perfect fighter in the bantam weight division. If Donaire can't make a knockdown or KO on their next fight, chance of him winning is less. And it will be his last chance to prove his stance. His power, speed, foot work become slower and slower year after year unlike Pacquiao that almost never change even on +40 years of age, good for him he retired.