And I readily admit I cannot cite any evidence against Boras.
To me it just the circumstantial evidence that nothing else explains what we are seeing on offense, and as Sherlock Holmes pointed out, once you've eliminated all the other possibilities, what remains must be true.
The offense had better health this year, and the OL was in its 2nd year together suggesting cohesion should be better than in any season for more than a decade. Quick is another year past his injury, as is Gurley, and a mediocre Keenum has to be better than the Foles fiasco. But nothing is working on offense. Nothing. It worked better last year with a total meltdown at the QB position. If somebody has a theory better than the OC, (I'd love to hear it as long as it is supported i.e. "Fisher sucks" isn't an explanation).