Traditionally, the 4th and 5th infielders are a versatile middle infielder type like Garcia and a corner bruiser type with some power who can come off the bench in the late innings with some pop. The latter was supposed to be
Gyorko. It became Voit for awhile.
It may be Voit again in the future. You never know. That spot may be for a bat and not necessarily versatility.
Garcia has an .858 OPS in the second half. He’s got a .373 OBP for the year and can play any position needed. He will definitely win a spot. Diaz hasn’t done well in AAA at all and I don’t know if he can get it back before the end of the year. I’d be more inclined to have Alex Mejia playing over Diaz once the rosters expand.