As far as I can see Reid has never played guard before. below is his player bio from ucfathletics.com
REDSHIRT SENIOR SEASON (2010):
-All-Conference USA First Team
-Started in all 14 games on the season
-South Dakota 9/4:Started at right tackle
REDSHIRT JUNIOR SEASON (2009): Named to the coaches' All-Conference USA First Team...Played and started all 13 games at right tackle on the offensive line.
SOPHOMORE SEASON (2008): Saw action in all 12 games at right tackle, making 10 starts.
REDSHIRT FRESHMAN SEASON (2007): Named to the coaches' All-Conference USA Freshman Team ... Saw action in all 14 games on the place-kicking special teams units ... Earned his first-career start vs. Tulsa (Oct. 20) ... The start vs. the Golden Hurricane was the first of four in a row at right tackle for the Knights.
TRUE FRESHMAN SEASON (2006): A scholarship recruit, redshirted while practicing as a tackle for the offensive scout team.
HIGH SCHOOL: Two-year letterwinner at Haines City High School for head coach Bill Buldini ... First-team All-Polk County honoree ... Second-team all-state selection ... Participated in the Central-South Florida All-Star Game.
Reid was slated as the Ravens starter at right tackle last season before the team signed Bryant McKinnie and moved Michael Oher to the right side. Jah Ried was then moved to the bench and was only used in the Ravens "jumbo package", when they were trying to pick up short yardage or goal line situations.
Reid struggled in pass protection in the preseason in 2011 but he did not seem completely lost. He definitely shows potential at the NFL level. With his size at 6'7" 324 lbs. Reid has the physical prowess to be a tackle, but does that mean he could be successful at guard? I guess we will have to wait and see.
Baltimore may find a way to keep Grubbs or draft someone ready to step in and replace him. In any case it will be interesting to see how this offensive line shapes up in the off season. The Ravens know they are a team in the Super Bowl hunt so they can not have any holes in their offensive line. This leaves them with some major work to do...