I'm not sure. I think that he's weighing a lot of things, which is why he isn't saying very much. I think that it was between UF (chance to win), Nebraska (going home/dream job), and UCF (low pressure/build something).
Gator fans are saying that Frost was not the top of their board, but I don't believe them. I think Frost turned them down and now they're in Chip Kelly purgatory with no coach. So now it's between Nebraska and UCF. I think Frost wants to coach Nebraska EVENTUALLY, but his dream job opened sooner than he wanted it to.
Now he's deciding if he wants to continue to build and develop UCF in a low pressure environment and risk losing his dream job if some lifer comes in, or does he go to Nebraska now, while he's still developing as a coach and if he can't adapt his system, he could lose the job forever.
Just my humble opinion.