Day, nor anyone here, is describing Seth's season accurately.
Hold ya britches, it's analogy time.
You guys know I'm an avid golfer. If I were to strain a muscle in my shoulder I'd have to adjust my swing. When my shoulder is better, another adjustment to try to return to where I was pre-injury. When you change a repetitive motion, something learned under "muscle memory," it's difficult to return to your prior form.
Seth had a hand injury early in the season which affected his snap. He adjusted, not well, but nevertheless, he adjusted. We can just ignore that part of this story; but it's a disservice to Seth.