Late innings we have a runner on 3rd with 1 out. We need to tie or go ahead run on 3rd. Or leading off an inning where we are down a run and need a base runner, I prefer Tapia over Grichuk, especially if the second half of the season. Check out Tapias OBP and K rate compared to Grichuk..
Yea Grichuk could get lucky and run into one, but most likely not.
Regardless, as others have mentioned, look at this deal for the Team as a whole and not just Tapia-Grichuk. Probably just a chess move in the bigger picture anyway.