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Louis was a seventh round draft pick in 2009 and has looked the part of a below average player.
He was a big part in contributing to a horrible o-line last year, allowing sacks to quarterback Jay Cutler and tackles for a loss on running plays.
He does not give full effort during game situations and can be overpowered regularly by strong defensive tackles.
Last year, he lost his starting right guard position to Edwin Williams after the infamous New York Giants' 10-sack game, and Garza took over the final nine games.
Louis has not proven to be a consistent player. Having Spencer at center not only helps at that position, but it allows Garza to resume his starting duties at right guard, thus solidifying the line.