I think Pau held back and he could have given Tyson a bad night if he really wanted to.
IMO it had nothing to do with age, this fight had to have been 100% staged. There was never a plan for Mike to win, or knock out JP. It seemed obvious to me, lawyers and contracts got in the middle of this fight, which turned out to be nothing short of a business agreement. Reports of JP getting 40 M, and Mike 20M.
I've been following the fight game for several decades, and Mike's career since he was a teenager. It did not appear to me that he even made a single solid offensive maneuver on JP. He just danced around for 16 minutes. Last night we saw Money Mike, not Iron Mike.
Just on bets alone, look at how much $$$$ would have exchanged hands, much/most of those bets based on the pre-fight hype. That B slap to JP's face probably amped up some last minute betting as well. I mean, I don't blame Mike if this was simply based on $$$$, which to me it certainly appeared to be. It was just disappointing - yet at the same time I'm glad that he didn't get hurt. @ 58 yrs, nobody should be stepping in the ring.