It's not so much what he did in that fight its what he has been doing the whole time as a pro. He is very skilled very accurate and powerful.
Khan is overrated and always has been. I have watched every single khan fight as a pro and some before then and he has been Hurt and put down by poor opponents. Kell would tag him all night long and eventually put him out.
The fight will defo happen as soon as khan moves up and Kell will stop him