I'll do a quick search then, and wow, they linked Scully's father's offer well to enticing Scully:
"TOM Scully says he was unaware his father had been offered a job at Greater Western Sydney until after he officially joined the club."
Must have been a great selling job there, forgetting to tell him about it.
http://www.heraldsun.com.au/sport/afl/tom-scullys-dad-joins-giants-team/story-e6frf9jf-1226177665081
'AFL operations boss Adrian Anderson this morning conceded that the league's investigations officer Ken Wood had found Phil Scully may not have been employed if Tom Scully had not signed a $6 million five-year deal last month.'
Actually, it was pretty easy to find, took under a minute. Adrian Anderson confirms that without GWS paying Fat Phil over $600k then Tom may not have signed. Lucky you found the article confirming the date Fat Phil signed, so this confirms the time frame.
LOL oops