Whoa...um...there were quite a few folks in the mix. Houston Nutt, Sean Peyton, Bo Pelini, Turner Gill--all of them were either approached and/or interviewed for the job.
Honestly, I was hoping that they would have hired Turner Gill, but I was happy with the Callahan hire. I didn't see why they would have went after Nutt, and considering Bo's past (never stayed more than two years w/a team, if I recall correctly), I was more than hesitant to give the reigns to Bo (though I would had liked him to stay on as DC...especially now.)
I'm not sure how anyone can say they'd rather have had Wanny. After what he did to my beloved Bears, it would have taken decades to recover from what he'd have done to NU's program.
Pellini? He just wasn't ready to be a HC at the time. Other teams have interviewed and turned him down as well since then, I believe. I'd have loved to see him stay on as DC. I still wish BC would ditch cosgrove and bring him back. But I don't see it happening.
I also doubt Turner Gill was ready to be a HC. Maybe in a few years...well, that'd be different.