Look, Jeremy can play any deck and win. He even admits Mario is inconsistent, and he did play 2 Blisseys and a Theme Deck.
Whether Jeremy can win with any deck or not is, first of all, inaccurate. Certain decks work and certain decks do not work, no matter who plays them; furthermore, good decks do not work for everyone. Second, the statement is irrelevant: since Jeremy is a superior player, we must assume that he instinctively played a deck which he thought to be both sound and strong.
The truth is: Mario is an inconsistent deck, who's best chance of winning is at best getting the 25% (again at best) shot at getting a FTKO (Go first, and hit the Wild Kick heads).
I'm pretty sure there is plenty of evidence to support this, I mean 5 T1 wins in the Grinder? Then, you have others who just completely bomb with it.
Your assertions are, first, contradictory, for you say "the truth is" as if you know the truth, and then you state "I'm sure there is plenty of evidence to support this" which notes your own ignorance of the truth.
Second, your statements are arrogant, as if you have any authority. When have you played Mario? If you were truly interested in the truth, you would ask questions, and not produce inaccurate information. Erik Nance, well-known great player and all-around nice guy, won Greensboro, NC BR yesterday with Mario. I was there, so I "interviewed" my friend on his experience: in his own words, the deck is amazingly efficient (strategy, energy, attack, defense), and consistent.
Third, your statements do not reflect truth at all. In every game with Mario, if I do not get the upper hand with Riolu early, Mario still goes the distance and comes back amazingly. At Greensboro yesterday, I lost to Flygon EX w. Drapion and Claydol tech, yet my loss was not due to overwhelming odds, but in that I needed 1 card to win and couldn't get it- just bad luck. This game lasted until time was called. I also lost to Garchomp, but only barely, and due to, again, being 1 card short. This game went to the wire also. Erik Nance's final games vs Kricketune were also dogfights in which he triumphed. All of this *evidence* and more like it disproves your "theory" that without T1 donk, you lose automatically.
And yes, we know Rambolt won World's, but Mario placed 3rd at World's, so we're not exactly looking at the whole picture, are we?