1. The defender lowered his facemask.
Lowered his shoulder. Like he was taught to do from pee wee, through high school, and now in college. All of his coaches watching this were proud.
2. First contact was helmet to helmet. You can tell by the direction the helmet deflects, which is NOT toward the shoulder, but the other helmet.
Helmets can touch. Its football. If touching helmets were grounds for targeting, both teams would have their entire defense ejected by half time.
3. Shoulder contact to the facemask is second, which stops the left-side deflection and causes the helmet to roll forward. There clearly were two different deflection points, each pointing toward the point of contact.
Thats speculation. On top of that, the refs can only call what they see. It took a slow-motion video for you to sit through and watch to even come up with that speculation. If it was reviewed, there wouldn't be enough evidence to overturn the call on the field anyways.
4. Shoulder to chest contact is third. You can see the body react the moment contact is made, which lifts Kingston off the ground.
That doesn't matter. Football is a contact sport. Watch the video again and look for him launching. He didn't launch. Watch his knees and waist. He was already lowered coming off of a block and stayed low with his shoulder.