We currently have 18 relievers on the 40-man and a few of them can also start. That's a lot but its good to have pitching depth. Some will obviously be in the minors, maybe guys like Palencia, Kilian etc.
Your list is missing some SP who may wind up in the pen if there's no rotation injuries, 3 of Brown, Rea, Assad, Wicks. Not sure where Poteet fits in. A guy like Wicks could maybe stay stretched out in Iowa if he's not needed in the rotation, who knows.
I have doubts we sign 2 closer-types like Pressly/Robertson. Even if its one, having Hodge, Brown, and Mayweather to setup would be solid. Injuries always happen though. My ideal is Brown taking the #5 SP spot if everyone's healthy.