I emailed the PSTP office and got different answer, although it is not the director who answered my email though. They said MD and PSTP are separate committee, so you have to be accepted by both MD and PSTP com to be accepted to PSTP; if you get rejected by PSTP, you are still considered for MD. Essentially, PSTP decision has no bearing on MD only admission. I think it doesn't really matter how the process works, it is either accept or reject, not that if we know the process it will change anything lol. But I guess we all need to know more to feel in control in the random process