PA are a better gauge than AB for Vavra in particular as someone who walks a lot. He got 184 PA at AA last year and 110 at AAA so far this year. I'm a bit confounded by his slash line this year. His ISO has plummeted to what would probably be an unsustainable level if its legit and his K-rate has dropped quite a bit. His AVG is up a lot, but his BABIP is nearly 400 so don't know if its just lucky or if he's attempted some change to his swing to maximize contact and singles at the expense of power. Probably just a quirk of a small sample.
I'd be fine with him coming up as soon as right now. Also ok if they keep him down for another 100 or so PA and then bring him up in mid- to late-July. He's 25 years old, don't really need to play it slow.