Well, another way of looking at the blue draft decks winning, is to open a Mimic Vat . This insane card will win you games, no matter which color you are in.
"But, surprisingly, blue decks have won quite a few PTQs!""Surprisingly"? There's nothing surprising about a pro telling me that blue is the best colour. It doesn't matter what year it is or what set we're talking about: between design bias and player bias, pros will do everything they can to play blue and win with it regardless of how good it is.
In draft, Blue is often one of the worst colors, which is why that statement is surprising. Perhaps noting which article you are reading might help.