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Left Tackle: Will Beatty (Okay potential)
Left Guard: Mitch Petrus (Excellent potential)
Center: David Baas (Very good potential)
Right Guard: Chris Snee (Good potential)
Right Tackle: David Diehl (Bad potential)
At this point, the Giants' 2012 starting offensive line will most likely be the above list.
Will Beatty, a good-not-great left tackle, will get the starting nod most likely because no one else offers enough competition for the role.
Although Kevin Boothe currently takes first-team reps at left guard, he by no means has secured the position and, after a long and intense training camp battle for the spot, I highly doubt that offensive line coach Pat Flaherty will be able to pass up on Mitch Petrus' ability and potential.
David Baas, meanwhile, will be starting at center and should improve after a full offseason and more experience in New York. If he turns out to be a bust, the Giants will be hurt financially but still have Boothe as a potential backup plan at center.
Chris Snee, like Beatty, has his job at right guard secured due to the lack of competition, but he is also extremely talented and the best player on the line.
David Diehl surprised many by taking the starting right tackle spot during OTAs, and although nothing is certain as of now, Giants coaches do not seem to high on Brewer as of now and seem to trust Diehl more. Of course, that isn't necessarily a good thing for Eli Manning and the running backs.