They got back a prospect who is essentially equal to the one they sent to the Dodgers in the trade for Margot. If Margot is a waste, it's just cash.
Margot's dropoff defensively is concerning and the sprint speed metrics agree he is slower. It points to an overall decline in athletic ability. That might be due to an injury but it means he's not likely to contribute. His batting numbers keep getting worse, which is another bad sign. I'd rather see the lefty hitters get the at-bat and stay in the game than see Margot pinch hit for them.