Valuev...well then how about Vitali Klitschko...a giant who most certainly had to land a lot of punches before the ref would finally stop it...the same Vitali who basically could not put a dent in the questionable chin of Lennox Lewis, yet two smaller guys come alone and one puts Lewis down and out, or how about Lance Whitaker, or Jameel McCline...I would try to name some others, but the real big fighters rarely ever make it to the top...again...size doesn't mean shit. Another fine example would be all the steroid shooting body-builders with gigantic arms which can lift 200lbs and yet they still punch like a girl! About the only two big guys that I can think of right off hand that had really good punching power is Lennox Lewis and Wlad Klistchko, but Wlad's chin and lack of durability completely negates his punching prowess!
Fact...throughout history take a look at who the hardest punching heavyweights of all-time were...they were guys like Joe Louis, Dempsey, Marciano, Fitzsimmons, Satterfield, Tommy Gomez, Shavers, Tyson and Foreman...Foreman is the only one to really qualify as big...again...size means dick!
And for the 4oz. gloves to be such a big advantage, well the guys who fought with 4oz gloves fought once, twice, sometimes five times a month with 4oz gloves...it looks like if they had been such punishing weapons the guys would have fought as least as possible!