Agreed. If the top three all win tonight, it really takes everyone else out of the race. Heck, effectively if either UW or MD lose tonight, they're eliminated from the race. Any team that wins at least still has a shot, but it's really only blown wide open if both win.
However, I posted the Sagarin not to highlight that MSU and PU are favored, but that they are favored by VERY narrow margins, and both play in quite hostile road venues. Effectively not much better than a pick'em game. Given the narrow margin, I wouldn't be shocked to see either home team win.
Vegas has Purdue by 2 or 2.5, depending on the sportsbook.
Vegas has MSU by 1.5 across the board.
Vegas has UM by 7 on the road against PSU.
I.e. a Terp or Badger win won't be much of a shock, while a PSU win would be a major shock.