If the Ravens started the season today, they would play
Osemele, who started at right tackle and left guard last season, could be a left tackle down the road, but he has to improve his foot speed during this offseason. He struggled with speed rushers on the outside as a right tackle and it would be worse for him on the left side if there isn't significant improvement.
Osemele is a tremendous talent. He is athletic, has good bend and punch and the ideal torso to be a left tackle. But to face the other team's premier pass rusher you have to have "sweet feet" -- and Osemele isn't there yet.