Yeah it's like manslaughter vs 1st degree
People always throw out this 'repeat offender' tag and I think this should only be relevant if it's just a bad mis-timed hit. In Keith's case, it was an intentional, premeditated assault on Daniel Sedin. It shouldn't matter if you are a repeat offender or not if you are going out there strictly to injure someone.
And this case would be like a first degree attempt to injure. 8-20 would be satisfying. Shanny needs to send a clear message considering Doan did the exact same thing a day or two before.