OOA is a pretty great stat for outfielders. It takes into account positioning, distance traveled, batted ball data.
Bellinger was 12th in CF OOA with 5. He has in the same group as Bader, Harris, Rodriguez and Nimmo. Ortega was 40 and Morel was 43.
He improves the team and he has some upside, even if it is unlikely. If he wasn’t going to make $17 million in arbitration the Dodgers would probably want to keep him. Trent Grisham, if he gets DFA or is available in trade, would be another guy to go after.