John Farrell has seen Jon Lester at his absolute best. Yesterday, the ex-Red Sox pitching coach watched his former pupil hit rock bottom. Even after compiling an advanced scouting report that suggested Lester had more chinks in his armor than at any other point in his career, Farrell didn't expect to see the outing the Sox starter produced yesterday in the Toronto Blue Jays' 15-7 victory. Lester allowed home runs on his first and last pitches, and the Blue Jays totaled 11 runs against him on nine hits in one of the dozen worst starts in Red Sox history.