Have had this discussion in basketball, but the RPI itself is flawed.
It looks like Michigan State has only played one team with a losing record, and they are 5-6. We have, too, but Norfolk State is 3-8. Also, because of weather and schedule, Michigan State has played 8 of 10 on the road, and the other 2 are neutral. They haven't played a home game. That will generate a better RPI. Early RPI numbers will benefit teams who play tough schedules or the northern teams who win a bunch of road games. Our RPI might have fallen a spot or two after having swept Norfolk State because it was at home against a 200+ RPI team.