That number's plucked from thin air.. I thought about going with 90%, but decided to up it to 95%.Not sure about 95%. "Culture" has a massive, massive impact.
Players who got traded from year 2000 to Sydney had a much much better success rate than players traded to Fremantle or Richmond. Dont tell me that has nothing to do with Sydney's strong culture and leadership and development.
You are absolutely right with your comments about Sydney. I still think that the majority of it comes from within the player themselves though.