I reckon AJ stops him around midway, maybe sooner.
I think his best form of defence is attack against a smaller guy and expect him to come out very aggressively from the off.
If he can land the huge right uppercut early I think he'll shake Povetkin to his boots then finish him as the ref waves it all off.
I think the fact he's been getting a fair bit of stick after the Takam and Parker fights will be in the back of his mind.
Add to that Whyte putting Parker down when AJ couldn't and Wembley still not fully sold out we should see him seriously looking to put on a big show on Saturday.