The old Kirk was a rule breaker, he did violate orders in Amok Time but was later allowed to go to Vulcan, just as he crossed the Neutral Zone in Balance Of Terror before he was given permission, Then there's breaking the Prime Directive in A Private Little War. But this Krik lost his father at an early age and clearly is a rather more reckless person than the other Kirk. Still though I can't see his command being returned to him by the end of the movie.