Gilgamesh is indeed predicting quite high, so that's a bit unbelievable.
However, Aion is predicting Xbox 360 over PS3. At least Gilgamesh takes the current selling patterns into account in his post to get the order right. On the other hand, Aion has always focused solely on Xbox 360 positive news, so it's not unthinkable his prediction is more a hope - which he's perfectly entitled to :)