Marrone searching for LG options

For the first three practices of training camp, the Buffalo Bills left guard battle looked like a no-contest: Colin Brown took all of the first-team reps, and didn't appear to have any major lapses, even after full-padded practices began.

Yet on Wednesday, Doug Legursky saw time with the first unit, reigniting a position contest that head coach Doug Marrone said Tuesday has been overlooked by some entering training camp.

Brown and Legursky are near-opposites in size: Brown stands at 6-foot-7, 326 pounds, while Legursky is the shortest of the Bills' linemen at 6-1, 315 pounds.

The two were the most experienced players in the left guard competition until Buffalo added Antoine Caldwell over the weekend. Caldwell is still getting up to speed with the Bills offense, but Marrone said Wednesday that he is looking to add another player to the left guard mix.

"It's inconsistent play out of that position," he said. "We need to become more consistent. I think that we have to look to maybe throw someone else in the mix. I don't know if I see the separation that I liked to see right now."

Including Caldwell, here is a look at who that third player might be when the Bills return to the practice field Friday:

Caldwell: With 19 career starts, Caldwell brings experience to the competition. The third-round pick of the Houston Texans in 2009 can play both guard and center.

David Snow: Second-year guard/center was an undrafted free agent from Texas. He started two games at center for the Bills, and at 6-4, 303 pounds, has the size to move outside to guard, and has seen time at the spot with the second-team in practice.

Keith Williams: A sixth-round pick of the Pittsburgh Steelers in 2011, the Nebraska product spent most of last season on the Bills' practice squad. He could be the largest player in the competition, standing at 6-5, 330 pounds.

The Bills open their preseason in Indianapolis on Aug. 11, which will be the first test for the players competing for the starting job.

"I'm looking towards going to the preseason games and seeing how they perform in the preseason games, but, right now, it's not solidified from the standpoint that you probably want to be right now."