The Western Bulldogs were perceived to have taken a bit of a gamble in using such a high draft selection on a young player from the suburbs of Sydney, which traditionally is not an Australian football area. Addison was one of the better NSW-ACT Rams players in the 2005 AFL Under-18 Championships, coming via the St George Crows in the SFL. He attended St Gregory's College, Campbelltown and completed his HSC in 2005.
