I'm spitballing here, but it obviously wouldn't be a one for one deal, other assets would be included.
Either way, Arjun's bat has "bust" written all over it, regardless of his glove. Deal him while he's still a top-100 prospect, I say.
Controversial opinion: The front office should prepare for the likelihood of Arjun ending up like Orelvis and deal him this offseason to the d-backs (while he still has value) for one of their IF prospects who can actually hit consistently (Crisantes, Troy, etc.).