Anyone who has looked at the RPI realizes that the Ivy League had fallen from its recent perch, squarely in the teens, first to the absolute bottom of the list before rebounding to the high 20s.
While the league has struggled this season, the binary win-loss nature of the RPI is currently punishing the Ivies far too much for their close losses, something which should even out and lead to the league's rise over the next month.
Pomeroy tells a different story, as the league sits 15th nationally, primarily on the strength of the overly generous preseason rankings, which are still biasing the team ratings in his system.
The ultimate answer likely lies in between the two. Massey's composite rankings, which look at a wide ranging group of ranking systems, have the Ivy League in 21st, and Sagarin's predictive model has the league 25th. If forced to pick a narrow range within which the Ivies would be likely to fall, those boundaries sound as good as any.