Another article I've found which backs up the need for both hand fighting and balance attributes for the OL and DL. Imagine a scouting report that possibly lists "other hobbies/sports". If you see "wrestling" next to an OL that you think is a bit of a project in terms of skill, their balance might be exceptional and worth a pick. Balance would affect how they resist a bull rush or pancake block, whether the OL leans too high (or waist bender) so gets toppled easy or falls forward too easy when the DL uses a side step finesse move. If you play OL or DL and you're on the floor, you're finished for the play!
http://www.espn.com/blog/minnesota-v...-vikings-draft