Brady himself would admit he’s a also a product of a superior OC and superior game plan week in week out. I know because I know enough broadly and semi directly to know.
You place Darnold in the Pats system and he would light it up. Obviously not to the GOAT’s level starting out - but he’d light it up over time if not within a few weeks
If we wish to point fingers point then point every which way but young Sammy Darnold. The kid has the skills. He’s been thrust in to awful awful awf