Like I said earlier, if he beats out the top 100, then he is the best. Fact. Like I said, they have all of the resources that he does. You're focusing on the wrong thing, I think. I don't think anyone would care if Hotshot (or any known player of that caliber) started over and climbed to the top again in 90 days. What makes this noteworthy is that he has NO LoL experience, and while LoL, DotA, and HoN are related, they are not the same game. This would be analogous to a Command and Conquer pro beating the best WC3 players (at WC3) after only 90 days of playing it. Same genre, different game.
C&C and WC3 don't have Levels on the account, and out of game boosts to ingame abilities (runes/masteries).