I see that Argenis Diaz is batting .295. Checked his splits; he's showing a severe platoon split, which, per Vlad, he shouldn't be (minorleaguesplits.com's "Neutralize luck" function says he should be OPSing .607/.782 vs. RHP/LHP). His K rate is high (over 20%), his BB rate is low (5%), and his BABIP is high, but not outrageous for a young, fast guy (.365). All of which is to say that he still doesn't look like a ML solution, but he's looking a bit more interesting, I think. I note that, while his career AVG is .269, his career OBP is .331, suggesting that his current low BB rate is atypical for him.
Presuming excellent (approaching Jack Wilson level) defense, what does he have to do offensively to be worth thinking about? I'm not talking about right now, of course. But if he hit, say, .285/.330/.350 over the next 150 games at AAA, does he become an option?
I do note that, per the MLE, that split translates to something like .600 OPS in Pittsburgh. Oof.