Thats fine. But they were always going to get Romys bat in the lineup against lefties.
My hunch would be Romy would play DH, Duran jump into a corner OF spot, Abreu to bench vs lefties is how you would platoon Abreu with Romy. You keep Duran playing OF sometimes so the skills dont erode. And really Im choosing Abreu because he seems to be the odd guy out vs lefties (I expected him to play vs lefties last year and it didnt happen and Moon reminded me a few times that I was wrong, so Im just trying to not repeat past mistaken assumptions). Understood, a few moving parts here (Duran to LF/Anthony to RF).
So maybe they would have platooned Duran/Romy at DH, so you can keep Anthony in LF always and Abreu in RF always (less moving parts). Maybe you platoon Romy with Mayer.
BUt if Dham is going to have a .680 OPS vs righties and Romy .900 (vs lefties), thats roughly .733 (assuming lefty 25%, so (680*3+900)/4
What I am saying is including Romy is raising that from .680 to .733 and I dont think its accurate to compare that .733 to what we would get from Bregman (.820). Because if we got Bregman, that .900 OPS vs lefties (romy) would still be in the lineup.
Lets say Romy would platoon with Mayer if we got Bregman. So, I look at mayer OPS vs lefties, which was like .400 but tiny sample size, so lets say .600, so our apples to apples comparison is (.680*3+.600)/4 which is .660. So by not signing Bregman, its a drop from .820 OPS to .660 because 3/4 times is DHAM bat in the lineup now that you dont have Bregman (when its a righty) and 1/4 time its Mayers bat in the lineup (when its a lefty).
I still think we get an everyday infielder at some point, and even after we do (assuming we do) ROmy will still play vs lefties. So dont factor in Romys OPS when deciding how much that *acquistion* infielder helps the offense becasue his bat is NOT coming in for Romys. Its coming in for DHAMs 3/4 times and Mayers 1/4 times.