I stand corrected, Dunk's debut was in 2010 away to MK Dons the season before: http://www.skysports.com/football/mk-dons-vs-brighton/teams/210512 and not the season I listed above.
Withdeen debut: 2010 at home to Woking (starter)
Withdeen league debut: 2011 at home to Swindon (90 minute...
He started two league games, and was a sub in three more. He made his debut in the title winning 2010 - 11 season.
Scroll down: https://en.m.wikipedia.org/wiki/2010–11_Brighton_%26_Hove_Albion_F.C._season