Linehan never had this kind of anticipation to be a HC. He left Minnesota and went to Miami, even while Tice remained the HC, because he was mad that nobody wanted to hire him after the 2005 season.
Not that I think Johnson is a sure thing. I could see it being a disaster, or maybe something like Mike McDaniel in Miami. Might still be able to call a good offensive game, but not being able to run a functional team.
And if he's taking his queues from Dan Campbell as to how to be a HC, and that's a strong possibility, it could be a problem. Those two do not seem to have anything close to the same personality; nobody has the same personality as Campbell. If he tries to be a hard-nosed-but-softie-but-still-Alpha type, I think it's going to come off as phoney.