After spending a year on the Adelaide Crows list as a rookie in 2002, Thomas went back to the SANFL where he worked on improving his game, and he won a Magarey Medal in 2004.
[2] Thomas returned to Central District in 2006 and was appointed club captain in 2007.
He was captain of the Bulldogs winning SANFL Grand Final teams in 2007, 2008, 2009 and 2010.
He won his second Norm Russell Medal as Central Districts Best & Fairest in 2009 to add to his 2004 win and in 2008 was named the Bob Quinn Medalist as for his best on ground effort in the SANFL's annual ANZAC Day match played at the Adelaide Oval between the previous season's grand finalists.
[3] Outside league football, Thomas works at Henley High School, as a P.E.