Wilson originally is from North Carolina and is a UNC alumnus. Before working at OU, Wilson was the offensive coordinator for the late Randy Walker at Northwestern (1998-2001) and Miami of Ohio (1992-1997). While at Miami, he would have worked with the late Terry Hoeppner, who became Miami's head coach when Walker and part of the staff departed for Northwestern. As the above link to the Broyles Award notes, Wilson was nominated for the award in 2000 as well, when he led Northwestern's #3 ranked offense. The Wildcats, you may recall, shared the Big Ten title with Purdue that year, altough if he is hired, we will have to forgive him for NU's late-season choke against Iowa that handed the Rose Bowl berth to Purdue.
Again, no one knows whether this rumor has any veracity, but it is persistent and widespread.