does he then tie with wlad for the number 1 rank in the hw division then for instance' 1. wlad/povetkin 2. vitali etc. etc.
It would mean nothing. Povetkin would stay as a Top5 heavyweight. However, Rahman's name has some value even today. He was a former heavyweight champion of the world. Povetkin's prestige would increase.
It's hard getting beat up for a living, like Rahman. But he didn't buy a small local bar or a Wendies when he had the money. One don't have to be physically dexterous and actually flip a burger so Raman could work in his Wendies. Tending bar requires being able to remember how to make a drink to shake it. So that might be hard because of being punch drunk. He should make this his last fight. It's better to say, I lost my last fight to a Champ, than finished a winner beating some one no one ever heard of in a place he can't remember.