Research can be a reason that a med school appreciates a non-trad student, but I can tell you that most of the ones I know, including myself, had low research involvement. IB, consulting, teaching, pro to semi-pro sports, veterans, lawyers, and so on. It's all about your background and career; that's what you're evaluated against, not a student who spent four years in their undergraduate lab and then took two gap years working in the same lab. Sure, that student may get into [Top School] as well, but that's not the student keeping you from a top school. I do have a couple peers that came from PhD backgrounds to medicine, but they're a different bucket.