I may have commented on this before but to clarify I think that you are both right.
1) a traditional undergrad with a nursing major trying to directly from UG into med school is at a competitive disadvantage for a number of reason and I think that is where the 27% figure likely comes from.
2) Nurses who have been working for sometime with a large percentage likely to have redone most, if not prereqs, would make excellent candidates where I speculate the 85% statistics come from.
Thanks, Gonnif - I was going to say the same thing. Straight from nursing school to med school - may be more of a hindrance than a help. Significant clinical experience (especially with evidence of good job performance - advancement, certification - definately a plus.