Daniels was an unknown last year. Tendenices, strengths and weaknesses, how he tends to read Ds and react to them, were all unknown. They are far better known, now, and this leads to better D preparation of the opponent.
It's sort of normal that successful rookie QBs or successful rookies at any position, face extra attention in year 2. Daniels will either learn from it and develop over the long schedule, or perhaps find himself discouraged. Check back in a couple of months.
