The GPF has never been a good predictor of late season success, not even in ice dance.
2005 GPF: neither B/A nor Den/Sta went to the GPF. B/A won Olympic and World medals, and Den/Sta won the World Championship.
2004 GPF: Den/Sta medaled at the GPF but finished 5th at Worlds, while G/G didn't go the the GPF but medaled at Worlds.
2003 GPF: B/A medaled at the GPF but finished 5th at Worlds.
2002 GPF: N/K medaled at the GPF but finished 4th at Worlds. B/K didn't compete in the GP but won 2003 Worlds.
2001 GPF: B/K won the GPF and D/V won bronze, but both finished off the podium at the Olympics. L/A didn't do the GP but won Olympic silver and World gold.