I've been meaning to ask this for a while, just keep forgetting... what are the physical and talent traits that make a good guard vs a tackle? I look at the draft when Mankins and Kaczur came into the league. Mankins is obviously the better athlete, but projected to be a guard in the NFL. Even if Light was out, Kazur (or Britt) would move to left tackle before Mankins would be considered. What makes Mankins the better football player, yet the lesser tackle?