After watching the rematch of Donaire vs Naoya Inoue, you can see that Donaire no longer has his main advantage - speed and simply does not have time to react to enemy attacks, age still affects, and by moving to a heavier weight category, he also risks his health
Yes, right? Donaire is not that agile anymore to react and move quickly but he is still strong and capable to deliver knockout victories, which I don't doubt about him but this time there's a catch because he needs to find that correct phase and timing to give that knockout shot.
Also, we can see that Inoue has turned out to be a different monster, it's so different that Donaire himself didn't anticipated that because the new version of Inoue is much more agile than his prime years and much more stronger to be a heavy hitter in the bantamweight division.