I just looked at his output at 3B this season, total. As a 3B he's hit like 240/290/300 and has 0.0 fWAR at that position. I'm not suggesting Gio's splits or previous performances. But the point is, yeah, that sort of a line isn't good but is essentially replacement level. So as a weaker side of a split, its easy to roster. Maybe Wallner could eventually figure out lefties, but there's nothing to suggest he will anytime soon and allowing him important PAs against any is a terrible idea.