First base is traditionally a position from which you want to generate power at the plate. That has changed a little bit over the last decade or so with guys like Corey Seager and Marcus Semien providing pop as middle infielders, but the corner infield spots are typically power spots in the lineup.
The Rangers aren't getting that from Jake Burger, who is currently on the injured list for the second time this season with a jammed quad muscle. Of Rangers with at least 125 at-bats this season, his .659 OPS is currently the ninth-best and his .