Seems to be a non-issue, meaning isn't that what all defenses try to do, disguise what the coverage is? The Bills are supposedly very good with this as Belichick has exclaimed. Even Brady could be fooled. It takes years for QBs to figure out what the D is doing, and O-coordinators set up pre-snap movement to try and help their QB decipher the coverage. I'm sure Allen would say he's constantly learning.