1. If Kaino had possession of the ball, run it up at Dennis and had hit Dennis as a tackler in exactly the same way, is it still a yellow card? A penalty? His shoulder still connects with an eyebrow so why not card or penalise the ball-carrier?
2. Cheika didn't plan it obviously but it seems he was keen to get the ref to see his way on things.
If you can't see how bad this looks, there's not much I can say really.
Of course it wouldn't be a penalty if Kaino was the ball carrier. The law refers to a tackler not tackling a player above the line of the shoulders. Kaino's shoulder hitting Dennis in the eyebrow would suggest that the tackle was too high.
I don't agree with the yellow card because Dennis did drop slightly into the tackle. If you're a defender and you're relying on the ball runner not dropping the slightest bit into contact to ensure your tackle isn't high you're going to be caught out regularly though. The onus will always be on the tackler, not the ball carrier.
I can definitely see how bad this looks. It seems fairly certain though that if it was as bad as it looks, more action would have been taken. Do you really think if Cheika had bailed up Peyper in the rooms and physically or verbally intimidated him it wouldn't have been taken further?
I think it's definitely out of the ordinary and the rule exists because it isn't appropriate but I think the reaction afterwards indicates that there's nothing further to it.