Comparing to older players is fun, but ultimately useless, I think.
The game has moved on. The athleticism involved now, the speed, the science behind getting athletes at their peak performance, it's a different beast. When you start losing the edge you have through speed and fast hands (which are Mookie's gifts), the science will push the game on and there's a good chance the game will pass you by somewhat.
I don't think he will age well. I hope for his sake I'm wrong, but I think he will become a solid player, rather than the magician we have seen the last two or more years.
The real shame is that $200 x 8 offer at the end of 2017 didn't get it done. Even if we'd gone to $250/260, we'd have gotten his best years locked in, and not had the money to make the mistake we made on Evoaldi and probably wouldn't have extended Sale as early as we did.
This is why projecting contracts and situations we could find ourselves in going forward is so difficult. There's a sliding doors moment around every corner.