I thought I'd throw in my 2 cents because it seems that we are on the reductionistic path of saying that top tier either matters or it doesn't. I believe it helps a little, not as much as in plastic surgery but it does a little. I also believe board scores mean more in the field of PM&R than being in a top tier school. This means that a person with a 230 from medical school #99 will beat the Ivy person with a 215, all else being equal (which of course is never the case). On the other hand if they both had the same score, the Ivy person would have it, all else being equal.
There are a lot of discussions about USMLE scores and name brand schools and this and that. I believe that these are just small components of a bigger picture. Whatever medical school you're at, you have an excellent shot at getting the spot you want in PM&R. Just do your best on the USMLE, clinical rotations, auditions, LORs, etc., and put together the best package you possibly can, and that's all you can do.
The RIC roster says a lot and it should be an inspiration, on the other hand their average Step 1 scores may be discouraging, but remember there are other areas that you can beef up your application. And in the end if you don't end up at RIC or Kessler or wherever, who cares. There are many solid programs out there, and unlike finding a spouse, you can fall in love with several of them. Best of luck.