I challenge anyone clamoring to replace Rosario to find an option anywhere near 1 year $9M that is projected to produce better than 1.5-2.0 WAR. Folks suggesting Heyward is an obvious answer may want to take a look at his actual numbers as a platoon bat. Here's a hint: they weren't better than Rosario's. So unless there's a steal of a deal for a bat like Robert (hard to imagine the deal they passed up at the deadline is suddenly easier to swallow now), pairing Rosario with someone like Grichuk is likely the best option.
AA's clear need is the best SP he can afford, then the best BP arm he can afford. The vast majority of his resources need to go towards those arms. That fact is just as true now as it was at the deadline. Someone like Elder simply can't be the SP in the 3rd game of a series...it's unacceptable for a true WS contender.
Hayward's splits were considerably better than Rosario's vs RHP. Heyward also gets on base a decent clip and can actually play defense well. Rosario doesn't get on base, he plays bad defense, and he's gonna be 32 next year. There will absolutely be better options available, whether that be either trade signing a FA. We need to move on.