I highly doubt that. Discmania put their first disc out in the fall of 2006. Will was still a barely-known regional phenom (14 years old, at the end of 2006 he had 3 1000 rated rounds to his name in 1 year as a PDGA member, high of 1023). Looking at archive.org it appears he was added to the Innova Scout Team in October 2007, or near that time (not on the website in October - on it in early November).
So if Will was with Discmania before Innova it was as a 940s-960s rated 14 year old in Tennessee at a time when their only offerings were the CD, MD1, P1, P2. It isn't impossible that he was with Discmania first, but it would be a huge surprise to me - I doubt they were scouting juniors in the Appalachia area at that time.