Service time will probably dictate call ups from Triple A more than anything. A few of the prospects will probably come up in August/Sept – unless the bottom falls out (very possible) then you may see the young ones come up in June…but not before that so that the service time won’t count.
This is after all a small market, lower budget team. They aren’t going to win anything (or probably even make it to .500) this year – so why not keep the young guys of the future under control for an additional year?