After pretty much all of their OF went down with injuries
Sheets had been working on his OF defense for a year after they drafted Vaughn
Those two are much more athletic than Yermin
They can also catch a ball
Right now they still have the following options instead of Yermin: Eloy, Engel, Leury, Harrison, Sheets, Vaughn, Romy, and worst comes to worst, Cespedes, Basabe, and maybe Micker if he's still around? Hell, Mendick, Burger, and Velazquez are in the corners before Yermin. I didn't include Robert because he's in center field in all scenarios.