TFW you try to share your friend's good news to give more insight into how average stat applicants may be viewed at UTSW and all you get is doubt 😒 (this is a joke I completely understand where the doubt is coming from 😗)
In all seriousness though, my friend has extensive research experience, LORs from well known researchers in the state, and grew up low SES. Their story and experiences are a great fit for the UTSW mission and the Dallas area (at least from what I've seen). Although it is evident from data sources like MSAR that average stat ORM folks are seldom seen at UTSW, I highly doubt that it is an impossibility (actually, I know its not an impossibility because I was sitting with my friend when they scheduled their interview 😉).
At the end of the day, an II does not equate an acceptance by any means. Although I'm nothing close to an adcom, I'm sure that all applications undergo a comprehensive re-review after the interview stage before acceptances are sent out. During that re-review, I'm going to make an educated guess and say that they further trim their potential accepted students by once again looking at stats (but now in the context of the interview). The acceptance pool of students will ultimately be left for adcoms to build based on the attributes and mission they want UTSW to uphold (and if their focus is maintain high stat averages, I wouldn't put it past them to cut average and low stat applicants out of the mix even if they perform well at the interview stage).
People are free to believe what they want; after all, most of us are anonymous profiles on the internet with no way to prove credibility. However, for those of you who want to believe that mission fit matters even for stat power houses like UTSW, I'm just here to share a data point of optimism 🙂