Mitchell is still very young, so time will tell.
Many young players with heaps of talent go through similar. Too many sycophants blowing smoke up their butts telling them what superstars they are.
Apparently Freddy Fittler came back from a Kangaroo tour around Mitchells age, overweight with a real bad attitude. Thankfully Phil Gould was his coach at the time who sorted him out.
Jarryd Hayne is probably the best example though. Big, fast, naturally gifted. One of the best on his day.
Hayne would have to be one of the most inconsistent players whom comes to mind.
Let's hope that Mitchell has someone in his corner who can set him straight.
Come to think of it, maybe someone should use Fittler & Hayne as a comparison to show Mitchell that he has a choice; either fullfil his potential like Freddy, or go down in history like Hayne who wasted an opportunity. With his size & natural talents, Hayne could easily have been an Immortal.
It all boils down to attitude.