He doesn't have to. Povetkin is slow as molasses and would be hitting air. Povetkin would be hitting a lot of air like he did against Huck, but the big difference is that Bellew is a better puncher than Huck and has better headmovement.
First rd. A heavy combo from pov makes the bomber do the silly dance on the canvas before the towel comes in. This content is protected Easy work for pov. We know why wilder avoided POV like crack.
Bellew is getting his final beating soon, maybe then people will stop putting him in these fantasy matchups.