All this talk of Frost and Tressle being a package deal... How the hell does that come to be? Hey Tressle, you're hired and this is your OC. I don't think he would go for that, nor Frost.
Simple. Eichorst has a vision. Get an extremely successful and experienced guy to be interested. Then "suggest". Hey Jim, I have this thought i youd be interested in coaching here for a few years, about an OC as kind of a coach in waiting type of deal. Jim and Scott meet. Talk. Share ideas and philosophies to make sure they could operate well together. They can. Eich gets the deal hatched up. Everyones happy.
It's not as ridiculous of a stretch as you would think. Hell, maybe Tress says he wanted Frost on his own. He wants a prodigal son coming home type deal to help immediately reunite a fanbase and relate to the players what it REALLY means to play for Nebraska, so that Tressel can take advantage of all things special about Nebraska, and give him the ultimate inroads to embracing everything here.
it's really not that complicated. Lots of intangible dynamics that could lead to such a crazy deal.