More like offensive coordination and scheme design.
I think we are finding out how good some of our players were now that they have better designs, lines, and playcalling which to work with. I don't know how many times Manning called plays for Purdy, much like he did for Dekkers this year, to where there was no where to throw the ball when he needed to throw it. He would call slow developing routes, with every receiver seemingly being 15-20 yards downfield, and before anyone was out of their breaks Purdy was being rushed (worse with Dekker this year). Then you had the converse where it's 3rd and 10 and we run some ******** WR screen that never had a chance of working. Rarely did we run misdirection and play action was completely obliterated with the use of shotgun. Occasionally there were times, like the OU title game a few years ago, where Manning strung together some well called plays but those were aberrations.
Now that Purdy is in a system that operates under center, can utilize play action, utilizes misdirection, while having great protection he's thriving. He had absolutely none of that while here.