i dont know much about the postbac program but the med school itself partcipates in tmdsas and there is no rolling admissions there. just a match day. they have an early admissions program but i dont know to much about it.
i was accepted into the postbacc program, but am going to go out of state for med school instead. you get preferencial treatment when interviews come out for TCOM---you get them before outside students do. I would highly encourage this program