I've been paying attention too and I agree. He'll never be big enough to stalemate a DE one on one but he's taking care of the linebackers and safeties and looking dominant.
As a guy who used to play fantasy, I can tell you that this is 100% correct.
Ajayi will have 4 games with 45 yards, then one game with close to 300 and everyone will be talking about how he averages 100 yards a game.
https://nfltraderumors.co/2019-nfl-free-agents-list/
Dunno if there's any reason to make a trade... seems to be plenty of quality players looking for work right now.