In response to TFB12's comment:
I watched this play over and over in regular motion about 15 times yesterday and here are my observations..
It is very possible Welker was the initial target on this play, not Thomas. While manning is in the pocket he looks to his left to where Welker is running, Collins is blitzing, seeing talib in Welkers direction and with Collins in Mannings face Manning rushes a pass to Thomas. Thomas seemed surprised by the pass, not ready for it and drops the ball.
As Talib is running across the field after Thomas, he notices Arrington in his way so TALIB CHANGES his running path and decided to go inside where Welker is instead of outside around Arrington. There is no way Talib could have thought he would get in between Welker and Arrington and still cover Thomas...Could Talib have wanted to take a $hot at Welker?? Interesting thought.
Right before the ball is snapped you hear a Patriots defensive player say "watch the pick". Found that interesting.
Now, after reading this "Welker's action was full speed" in the above mentioned article, I am not so sure about that. I will have to look again. But I do remember the first couple of time while watching the play over and over yesterday, I thought Welker wasn't running at full speed during his route. We have all watched Welker run many routes over the years, some of the routes he doesn't run at full speed in order to disguise what he is doing and then hits a full speed stride when he reaches the part of the route where he needs to get open. It's possible his route was one of those type routes and Talib, choosing to go inside instead of outside Arrington, changed everything.
You're a Welker fan-boy, you can't help but see it in his favor, but you're wrong. Arrington was no where near Talib or Welker. Hell, Talib didn't even see Welker because rats sneak up on you due to their low character and length.
Are you a fan of Welker or the Patriots?