If Rowdy is the answer, you're asking the wrong question.
He had been terrible even before he was injured.
Sure, we can expect some regression to the mean, but we can't expect him to actually be a quality hitter. Might happen, but there is a good chunk of terrible performance that suggests it's not likely for the rest of this season.
I see absolutely no reason to have more faith in him than any of the guys hitting around .300 in AAA (or Black in AA), including Hiura, whom you seem to have a vendetta against.