Yeah, RPI is certainly a tool to use, but it's not a great predictor of seeding. Just last year, Syracuse had an RPI of 5 and ended up a 1 seed. The 2 seeds had RPI's of 4, 6, 11, and 22. There was a 3 seed with an RPI of 15. And no 4 seed had an RPI above 16. Winning a major conference tournament has historically helped seeding significantly. I remember one year Syracuse entered the BET on the bubble, ended up winning it and was rewarded with a 5 seed.