A FSU team that put up 38 on ND managed 17 a week later against Jacksonville St. and 14 this past week against what I am guessing is not an incredibly talented Wake Forest team (Norfolk St. scored more just a week prior)...yet, Purdue managed 13...I am not big on the whole transitive thing either, but, it should at least be concerning I would think.
I am still not sure how much the defense has improved...it has definitely improved, but, it would be damn near impossible to not have. It is still tough to know just how much better it really is in that I still don't know how good Oregon St. may genuinely be, UConn is irrelevant and ND has shown itself to not be very good offensively (including against Purdue). I am still skeptical that it can consistently stop the run, and, defend teams with quality skill players. To your point, however, I feel better about the fact that Rutgers is going to repeatedly run QB or RB up the gut and Purdue never stop them.
If this team somehow finds a way to win enough games to get to a bowl, that would absolutely be progress...and well received...but, it won't be easy, particularly if the OL remains the issue that it has been...and I don't know how that just magically gets fixed...thus the need to scheme for it and try to overcome the problem that way.