After reading post # 52 I must revise this post.
For posterity and the legal Minny LBer Anthony Barr tackle on Aaron Rodgers;the contact is clearly shown (up close) in a video and the following LINK.
I see a wrap up tackle here and no intentional hit to injure the QB.
A......Does Barr launch himself and lead with his helmet?
Anthony Barr's helmet does contact Rodgers but not in any manner to injure. Barr does not launch his body and lead with his helmet like a missile.
Any head (helmet) contact is simply a matter of course and the wrap-up tackle.
B.... Does Barr drive Aaron Rodgers to the ground to injure him?
I don't believe so.
I see a pure wrap up tackle and with some of Barrs weight on Aaron and that added weight to Aaron's weight and with Aaron's hand and forearm on the ground first! This causes the forces up to the shoulder to cause the Collarbone break.
I see no unnecessary effort on behalf of Anthony Barr to injure Aaron Rodgers.
http://www.businessinsider.com/aaron...arbone-2017-10