Arizona's defense was basically a 3-4 in a 4-3 base. That's what Pendergrast runs. It's a hybrid. The Chiefs will likely run the same thing with more emphasis on 3-4 fronts.
I see them moving Dorsey around the DL. He'll play both NT and DE, I see that as the most effective way to utilize him until he can handle the NT duties full-time. He could definitely develop into a Casey Hampton. But he could be a Jay Ratliff in the mean-time.
The Chiefs need to focus on getting a few 3-4 DE's and OLB's. Plenty of options in UFA, but they should also probably be the ones to pull the Jarron Gilbert trigger in the 2nd round if Tyson Jackson isn't there.