Purdue and Duke still have better overall profiles across the board. Heck, OSU's RPI is 31, right now. I don't know the worst RPI ever for a #1, but I'll be it isn't much over 10.
If they win out, they should get close to that, but Duke and Purdue both need to lose, as does Nova.
Don't forget OSU's best OOC win was Cal. Sure they played Butler and WVU, but lost. They are 3-4 vs the top 25, 5-4 vs the top 50 and 8-6 versus the top 100. Certainly solid numbers, but not #1 worthy. They'll need to beat MSU or Purdue in the final to really improve those numbers greatly.