With the four man bench and only one lefty hitter on it (plus a switch hitter who bats better from the right side), getting good pinch hitting matchups is going to be a challenge for Snit.
Most closers are righty. So it would be nice to have a good lefty hitter on the bench in the ninth inning.
Second, it looks like our 6-8 hitters (Phillips, Castro, whoever is catching) are all going to be right handed batters. That means when the other manager goes to his pen against that part of the lineup he will have a righty pitcher out there. So we come to the #9 spot in our lineup and there is a righty on the mound. Do we bring in Jace knowing that the automatic move by the other manager is to go to a lefty in his pen (it make sense for him to do it given how weak the righty hitters on our bench are and given that Ender is the next hitter).
Jace is not the greatest guy to have up there, but he happens to be our best pinch hitting option, certainly against righties. The problem is there are going to be a lot of situations where we burn him in the 6th or 7th inning (maybe he ends up not even batting in those situations if the other manager brings in a lefty) and have no lefty bat left come the 9th inning.
To me adding a left-handed bat to replace D'Arnaud on the bench or to replace the 8th guy in the pen is Roster Management 101. Remains to be seen if the front office sees it the same way.