Or maybe Robert is only a few weeks?
If that's the case, a lot of problems could be solved by La Russa yanking his head out of his ass and stop his "earn playing time" bullshit with Vaughn and Madrigal and putting Engel and Mendick on the bench instead of Lamb and Leury.
If it's worse than a few weeks, well, they should still do the above things, but they can trade for an OF, but they should probably trade a minor league pitcher (such as Thompson) before jettisoning core pieces like Eloy, Vaughn, and now possibly Mercedes.
I mean, honestly, you'd want to try and sell astronomically high on Mercedes before trading Eloy. It'd be dumb to trade Yermin right now, but it'd be dumber to trade Eloy.