First off, I'm not knocking Dame at all. He's arrogant and annoying sometimes but I don't really care.
To say it's a landslide is overstating it. Jay and Kanye have both had success and I'll give you that. To a much lesser extent, so did Cam when he was on the Roc. But Beans? Bleek? I like both of them too, but even at the top of their games neither of them really killed the game like that. The Diplomats had a big buzz, but they didn't have long term success (barely see any of them anymore besides dumbass "beefs"). Can't give him credit for R. Kelly since R. Kelly was real popular way before that. An album with him and Jay is an easy success, not something credited to Dame.
P did a lot of the same stuff as Dame, as far as other ventures with movies and the clothing line. Based on all the stuff you said, I'd put them as equal right now.