When it comes to the guards and tackles, ours are all at least 325 lbs or more but Karras wasn't as big. Most of the time the center is always lighter than the rest of the O-line.BTW it was pointed out on the "locked on Dolphins" podcast that Linsley doesn't fit the size parameters the team seems to have for their OL. He'd certainly be the lightest OL guy we have. Personally, I find size parameters for players to generally just be lazy and easy boxes for people to check rather than do actual evaluation. I believe it is far more important to work to find good players with the skill sets you want. But you certainly still see people focus on that.