There are a few reasons IMO:
1) He’s right handed; with the exception of Gonzalez, all the other alternatives are lefties (and Gonzalez gets hurt a lot, so what does that give you). The obvious counter to this is that doesn’t matter what side of the plate you stand on if you never actually hit the ball.
2) He can give you passable defense as a backup at both 3rd and 1st. Note I said passable, not gold glove.
3) He has decent speed, so he can serve as a pr if need be.
4) He’s cheap. His salary is $760K (MLB minimum is $740K)
He has no trade value and he’s not going to be here next year. Let’s face it, we’re talking about the 13th position player and the 25th-26th guy on the roster. Dalbec bring on the team in not going to make or break the season