I really don’t have an opinion one way or another about keeping Daniel Vogelbach. I am sure the Mariners will only get a “so-so” prospect for him unless they are able to trade him in a multi-player deal.
In the second half of the season, Vogelbach showed he has trouble hitting off left-handed pitchers so if he does hang around Seattle, he will probably platoon primarily at designated hitter though he could get an occasional start at first base.
Domingo Santana could be his partner as the designated hitter against lefties.