I'm sure there's some truth to your comment, but matching him up in man coverage with no safety help vs Gordon wasn't the brightest move in my opinion. Even if he's the healthiest he's ever been he doesn't make that play.
On top of any injuries, which is certainly going to be the #1 concern with Talib moving forward (it's been a 3 yr pattern with this hip issue), the injury losses to other parts of the defense is likely leaving the secondary more susceptible. The lack of any kind of pass rush is adding more pressure on the shoulders of Talib, which is probably just one of several reasons why his play his tailed off a bit.