I'm sorry but I have to call serious BS on this.
In Brady's first season as starter (2001), he finished 24th in passing yards per game (Taylor finished 29th in his first season as starter).
Just one season later (2002), Brady was 7th in the NFL in passing yards per game. Throwing to dime-a-dozen receivers like Troy Brown, David Patten and Deion Branch.
In Taylor's second season, he finished 27th in passing yards per game.
In Brady's third season as starter (2003), he was 9th in the league in passing yards per game. So far this season, in Taylor's third season as starter, he is 29th in passing yards per game (Bills are 31st as a team).