Instead of trying to understand the logic try reading the entire post first. Here , let me help you:
When Spiller is in the game, the defense is so keyed in on him, that if you use him traditionally, his effectiveness would decrease. Because the Bills offense has shown they are not consistently capable of beating you with passes downfield, when a running weapon like Spiller is on the field, he is far and away the focal point for the defensive players. I've seen it every Sunday. The second Fitz gets into the I-Form and hands it to him, the defense is swarming to Spiller.
Nowhere does it say use Spiller less.
Got it???