Whether he is sober or not i have def seen an improvement in his life. Losing a lot of weight and taking on new challenges is still something to admire.
He lost his mind, apologizing to Teddy Atlas. Teddy made his entire carreer out of knocking Tyson, on air and in private conversations with anyoen he could find willig to listen. Maybe Mike doesn't have all the alcohol out of his system yet. When he sobers up and finds out he apologized to Atlas, he just may go on a drinking binge.