The Ring magazine is rating Inoue as the number 3 pound for pound best. If my memory serves right, Donaire's highest ranking pound for pound was at number 4.
You only missed a bit, Donaire's highest rank P4P was at number 3 on 2011.
Yep the problem is that was a record on 2011, while Inoue ranked at number 3 in this year. I see this fight like Canelo vs GGG where GGG can't won against Canelo (even there's will be a trilogy), so I expect Inoue will win because of his prime, the location and also the judges. Donaire need really dominating in the ring, with his current agility now... there's a gap and wouldn't compete against Inoue.
That's the problem with Donaire now he is fighting a prime Inoue so for sure he will struggle for this and also Inoue is full of confidence as he already defeated him on his last match up. Most provably many bettor will bet on Inoue on this fight since they know that Donaire is at the peak or maybe over on his prime years.
He already fought Inoue in the past, so he already knows how capable Inoue is. yes, Inoue is still in his prime but Donaire also is still capable of winning, in fact, he is a champion now and therefore we have to believe that Donaire has a chance of giving Inoue his first loss.
So lets just see if we can see a good match between them here.
No doubt mate, it's guaranteed that we will witness a good fight.