Sean McVay never was a head coach, until he was.
Bill Belichick was never a head coach, until he was.
I've never understood the whole "You have to have head coaching experience to be a head coach" mentality. I mean it helps, yes.... But how does one get head coaching experience if you have to have head coaching experience to become a head coach in the first place? I'm not saying Kitchens is the next McVay or Belichick... But how else do you learn, if not on the fly (if you've never done it before)