There's a lot of debate about New England Patriots quarterback Tom Brady and the accuracy of his deep ball. Some point to his accuracy on long passes and how his completion rate has been in steady decline since 2007, with each year worse than the prior. Others will say that his receivers have been in such flux over the past few seasons, whether due to injury or integration, that he hasn't had the opportunity to develop a rapport with the deep ball.
Maybe Brady is declining. Maybe he's plateauing (and in support of this argument, Brady featured a top 10 deep ball after Week 4 of last season, once the offensive line was set, Rob Gronkowski returned from injury, and Brandon LaFell picked up the offense).