It's a bit more than speculative (copied from another post by gcg on our Board talking about this):
https://www.saturdaydownsouth.com/tennessee-football/jeff-brohm-better-get-now-gets-hot/
Brohm then went into damage control mode after the fact, tacitly confirming that there was reciprocal interest:
Speaking about his involvement in the Vols coaching search for one of the first times, Brohm didn’t get into specifics and simply told the Courier Journal that there was interest from both sides of the deal, and “where there’s smoke, there’s fire.”
http://footballscoop.com/news/purdu...ch-interesting-effect-boilermaker-recruiting/
I don't think this is going to be a negative vs. negative thing.
I think he goes to Purdue if he is enthralled with the idea of playing for Jeff Brohm and/or if he wants to be much closer to home.
I think he's a Cat if the gap between Mick McCall (who has tutored his share of All-Conference and NFL QBs, albeit with a much lower profile than Brohm) and Brohm isn't seen as that wide, and he wants more certainty with the depth chart (Sindelar vs a very wide open situation at NU) and with the coaching situation. I think the intangibles (family ties, his brother's experience, Kirtz if he ends up at NU as I think is very likely) play in NU's favour.
I think it could go either way, but with our purple colored glasses in Evanston, we like our chances, as I'm sure you like yours.