To follow up on the Peyton point, here is my speculation:
Peyton would not return phone calls all off-season. When he announced his decision, he shut himself off from the other teams. During season, Clark could not have contact with PM.
Yesterday was the first chance Clark could get time with PM to ask him truly why he wouldn't consider the Chiefs after it was widely speculated that the Chiefs were the best fit for PM.
I think Clark could have taken if Peyton didn't think the roster was there. But as people have said for a while, Peyton needed to trust the people he was working with and he had nothing but disdain for Pioli.