Kenny signed a contract. It didn't guarantee that he would be starting. Nobody knows what Tomlin may or may not have told him, but I doubt he unequivocally promised that he would be a starter, particularly after he didn't even finish the season as the starter. He's got a job with another...
Another way to look at it is Tomlin got a HOF level of performance out of AB, while other coaches couldn't even get him to stay fully dressed on the field.
All I know is I'm excited to see what Arthur Smith can do with Wilson and Fields. Was anyone really excited to see what he could do with Pickett or Rudolph?
This is like a 15 car pile up on the parkway. You don't want to look...you know you're going to hate yourself if you do look...but you end up looking anyway....