Is the reason why Bob never sounds the same live as he does on his albums because he has been constantly stoned for decades?

I know you Dylanheads are going to crucify me for this, because you’re always like “oh that Bob is such a genius he never plays the same song twice just like the stone that gathers no moss from his hit song Like a Rolling Stone” but have you considered the possibility that he is literally incapable of playing his old songs correctly because has fried his brains on pot?