It wouldn't suprise me one bit if he has become faster. He's the kind of player that HATES any weakness and is willing to work hard to correct it. I think his work ethic is second to none, and I would bet he works on his speed and footwork religiously. The kind of pocket presence he displays can only be learned through tremendous repetition. Look at the kind of muscle memory he has as he slides in the pocket. Perfect, absolutely flawless technique.
He's the kind of player that will improve until he retires. He reminds me of that kid who barely made JV in highschool as a freshman but had enough heart for three teams. Everyday, you'd see him in the weightroom, on the track, or working on his technique. At first, you kind of laugh at him, but then notice the improvement. Comes back the next year after a summer away and you're like "woah, kid got bigger". Soon, he's starting. Just keeps working harder than everyone and keeps getting bigger, stronger and faster. Then, by senior year he's the best player on the team. That's the exact way I see Brady. Ugh, mancrush.