Actually most O-lines in FCS could compete size and strength wise with most FBS schools. Just look at North Dakota States roster, they have one O-lineman listed under 285 with most averaging around 300. The difference between FCS and FBS is overall team speed especially at the skill positions, not size and strength on the lines.
Man, did you even read my post...."250 lb linebackers with 4.45 speed." Good grief.
~T~