You're essentially fighting against yourself here.
1. Based on GO/AO, he is below average. Based on ORS's numbers, he's barely above average. Regardless, if you dont consider him a major groundball pitcher, then his BABIP is pretty relevant.
2. If he is a major groundball pitcher, THEN, you would expect his BAA to be much higher since a groundball has a better chance of being a hit than a flyball.
Regardless, they all point to two things...
1. Buchholz has been incredibly lucky
2. Lester's peripherals are essentially the same when you look at WHIP and since Buch has been incredibly lucky this yr, then you have to take Lester's numbers.
Regardless, we're arguing semantics right now. I think Lester is a better pitcher and his season from last yr was fantastic. I would take a guy with a 1.20 WHIP, 200IP and 225K over a guy who isnt going to reach 200IP, is a contact pitcher, and is lucky