Uhm, since Brady won a superbowl in that period and was injured for the AFC championship game that season I don't know what you're talking about. Had Dak already won a SB noone would say a thing. In this context however one playoff win in all his career so far tells the whole picture and thats that. Sure it's also because of the team and coaches he played for, but at his position he's the guy in focus. And like Brees, maybe Dak needs a team change to get his break through?
But anyway, let him take us to an NFC championship game and it's a different story. Until then the current narrative fits pretty well.