I do like Weems despite some analytics that say he's been lucky rather than good. He's a bit old, but so is most of the bullpen. I think Davey uses him correctly. At this point, he's 3rd righty and gets medium+ leverage innings. He and Garcia are the 6/7th inning guys with leads. I expected that role to go to Floro, tbh. Barnes at this point I think is being used behind or tied and late. He's no better than 6th arm in the bullpen. I'm fine with that, at least until guys like Brzykcy, Powell, or Schoff are ready or somebody like Henry or Parker is converted to a reliever. I do think they'd benefit from more from Bleier being on the staff than Barnes and thought he deserved it more coming out of the spring, but otherwise, I'm ok with Barnes and Rainey being used in their current roles.
Regarding Rosario, he's an absolutely fine signing. That's not a knock on Young, who brings speed and D, but until Robles was hurt, I don't think this team was short on speed threats. Other than the catchers and maybe Meneses, Davey will be aggressive with everybody. Rosario offers power and average D. Best case for Young now is that there's a 2-3 month window before it would be ridiculous to keep Wood and Crews down, so it would be the best opportunity to gauge what we have with Young in the majors. I don't see him as more than a 4th OF in the long term, so getting reps in AAA is good. It's all moot if Robles is IL'd.