Purdue is still listed as the last #4 in this morning's bracket matrix---above Michigan. My gut feel is that Purdue is a textbook #5. I can't see how Purdue is possibly above Michigan on the committee's S-curve.
Purdue is ranked #19 in both NET and Pomeroy (above Michigan in both).
Purdue's record against Quad 1 is worse than Michigan (by 4 games), Arizona, Maryland, Kentucky, Wisconsin, Oregon, BYU, and UCLA. It's slightly better than Kansas. It's about even with Missouri, Illinois, and Texas A&M. It's significantly better than Louisville. Clemson has a winning record against Quad 1, but in only 8 games vs. 17 for Purdue.
Purdue's greatest strength right now is non-conference SOS. It's 10 spots better than Kansas, 20 above A&M, and well above everyone else. (Missouri, BYU, and Maryland all have 300+ non-conference SOS; Wisconsin and Mississippi are close to 200--for what it's worth). But, Purdue's overall SOS is in line with the SEC teams that faced a brutal conference schedule. Purdue is also tied with Arizona for the second fewest Quad 4 games (4) among 4/5 contenders (Kansas has 3). That's a marginal stat, I know. But it could influence some committee members.
Purdue's offensive efficiency (according to Pomeroy) is one of the best among the possible 4/5 teams, but its defensive efficiency is among the lowest.
Head-to-head vs. 4/5 contenders, Purdue is:
1-0 vs Maryland (home)
0-1, vs. A&M (neutral)
1-2 vs. Michigan (home win, road and neutral loss)
1-0 vs. Oregon (road)
1-0 vs. UCLA (home)
0-1 vs. Illinois (road)