Unfortunately despite the motor he just doesn't have the talent to get to the QB consistently. He may rack up 4-5 sacks through coverage or a QB being bounced his way, but that's not good enough for a starting lineman or a first round pick.
Not to overstate the OBVIOUS but I think we all know his issues.
That's was my point. Harris actually whipped the OT and looked good doing it.
Not just "lucking" into a sack.