I don't think that's true , the only time that happens is when an average footballer ie Seb wins a B&F playing in a crap or young team team , In general the B&F winners are always around the mark the following year as looking at past winners most either win it again or at least top 3.Most players have a down year after a B&F, be it injury or form; add to that a massive changeup in the team with style and personnel, not to mention hubs and bubbles, and you can see the odds stacked against a bloke of Seb's capabilities. Still played well when it mattered most, particularly the Richmond final. That in itself is a good sign since we're looking like a finals type team nowadays. He'll be better this year you'd think...and maybe with the guys around him and injury free...he may surprise a few.
Look at the result of this years B&F , 5 of the top ten are imports in their first or second years and the rest were just kids , it really shows how poor our team was 2-3 years ago.
Seb is and was always just a GOP , i think his time is limited with us IMO