How Susceptible Might the Yankees be to LHP in 2010?

I was thinking about the Yankees going into 2010 with the team they have now and how big of a hole LF might be. A Brett Gardner/Jamie Hoffmann platoon is not particularly impressive, but how bad might it be? The other concern is if Curtis Granderson's platoon splits in CF vs. LHP makes the Yankees particularly poor in matchups with LHP. So here's a quick look at two Yankee lineups, one vs. RHP and one vs. LHP. I'm using platoon splits based on what a player's done to this point in his career, but regressed towards the mean platoon split for same-handed batters using 2000 PAs. So in the case of Granderson, his projected 2010 platoon splits would be based on 685 PAs of his career platoon splits combined with 2000 PAs of the average LHB's platoon splits. Vs. RHP Ord Player Pos PA vs RHP 1 Derek Jeter ss 5 .341 2 Nick Johnson dh 5 .377 3 Mark Teixeira 1b 5 .390 4 Alex Rodriguez 3b 5 .386 5 Curtis Granderson cf 5 .376 6 Jorge Posada...