Jimmy was becoming a god in Dallas and a coaching god in the NFL. He was on his way to a dynasty and becoming the next Tom Landry, one of the greatest of all time, but he had a nasty little owner constantly bitch-jabbing him in the ribs.
Jeez, can you imagine having to listen to that moron every effing hour of every effing day? Calls late at night or five in the morning? (Just a guess here)(Hey, Jimmy, I got an idea, or hey, I just thought of a play, or a scheme that if you don't seriously consider I'm gonna whine and bitch till the cows come home.) I know you're putting in 80-hour weeks, but we need to talk about one of the players who told a banjo joke. It's like get the hell off my ass, you little (expletive stream deleted).
I don't care what Johnson said later, Jones had to be the reason he left, (and people lie all the time about their opinions of their bosses).
Since this is/was America's Team, and finally got its own high-quality documentary, maybe Hollywood should consider a movie next. Say an alternate reality blockbuster, wherein Jerry, after Jimmy's second SB Win, suffers a stroke and can't talk or move. He's confined to a wheelchair and Jimmy takes over the franchise.
Jimmy's Cowboys proceed to win the next five Superbowls. He's the toast of the town. He's elected Governor, but continues to coach the Cowboys to victories. And he keeps the fully alert invalid Jones around so that in private moments he can mercilessly taunt the guy. Jerry can only drool. Nobody understands what he's trying to say. I'd watch it.