1. 4 (Baylor 1, Kansas 1, Gonzaga 1.1, SDSU 1.48)
2. 4 (Duke 1.81, Dayton 1.84, Maryland 2.10, Florida State 2.33)
3. 4 (Creighton 2.79, Nova 2.98, Seton Hall 3.06, Louisville 3.11)
4. 2 (Kentucky 3.83, Oregon 3.96)
5. 5 (Penn State 4.51, Auburn 4.58, MSU 5.02, WVU 5.05, CU 5.07)
6. 6 (Michigan 5.6, Iowa 5.74, OSU 5.87, Butler 5.9, Arizona 6.1, BYU 6.12)

That seems odd to me, but may be an artifact of the parity this year. I don't remember noticing this other years, and I do pay some attention to it, but not enough to say for certain that this is the first year it has happened.