Okay, I just looked through Jacobs opponents since Pirog destroyed him on boxrec(who has Jacobs as #25 in the world at Middleweight BTW) and it is not impressive. So I went back and watched the Pirog fight again because I don't think you learn much against weak competition. Jacobs might have taken a couple rounds but at no point was he winning the fight. Pirog was in complete control throughout and it was just a when will Pirog knock him out type fight. I see absolutely nothing that suggests he'd be able to last against GGG. I realize GGG and Pirog fight completely different and GGGs more conventional approach may lead to greater success for Jacobs but I firmly believe he doesn't see the championship rounds. His defense just isn't there.