Not that it matters, but I'd call wRC+ a metric, rather than a statistic.
Either way, I'd prefer the Twins keep giving Wallner chances for at least this season. He does have the potential to be a quality hitter, and it's not like there are better options currently. There are a couple minor leaguers who are gonna need a chance soon, but there's low hanging fruit to drop before Wallner.
However, I disagree he's been a good MLB hitter to date, except in short stretches.