I think it is purely NETWORKING, like any other business. Willie T already has an established relationship with football coaches around here. They know who he is, he knows who they are. Bringing him in is like promoting a local branch manager to regional manager.. VS hiring an outside manager from outside of the company to be your regional manager [the best analogy i can think of].
Im sure skip knew SOME contacts down here before he got hired, but not to the extent that Willie does.
That being said, i think people overblow recruiting a little too much, and undervalue player development. There have been many great recruiters (i.e. ron zook) who couldn't develop talent, some who could develop talent but couldnt put together an overall team that could reach full potential (i.e. leavitt), and some people who aren't that great of recruiters but could develop the hell out of their talent (i.e. brian kelly).
my biggest fear is Willie T being a great recruiter, but not so great gameday coach. i know winning at WKU is hard to do, but we still dont know how good (or bad) he is as a gameday coach.