Povetkin v Klitschko Povetkin's Amateur Experience?

One of the knocks is that Povetkin hasn't faced anyone in the pro's who is Vlad's size or has that kind of punching power, i'v been racking my brain to try and think of guys in the amateurs that he fought that would've been on par for size and power i know jaksto from Lithuania is about 6'5 Cammarelle and Koeber are around 6'3 in the pro's Donald was 6'4 i was also wondering if he ever fought Timurziev when he earned his spot on the National team? that would be on par power wise with Vlad or close to. Anyone know? On a similar note the Klitschkos have said that they've faced 7 footers in the Amateurs when Valuev has been mentioned, asking how they'll deal with a guy bigger than them also Ustinov is in Vitali's camp sometimes and he's 6'8