At the time, Goff was the youngest QB ever to win an NFC Championship. They wouldn't have won a Super Bowl with Goff. That's because of McVay and not Goff. The fact is the Lions have gotten more out of Goff than the great McVay. Zac Taylor was the QB coach in 17 and 18 which were Goff's best years with the Rams. Taylor goes to Cincinnati and McVay becomes the defacto QB coach. That's when everything went downhill. As McVay became more involved, Goff got worse. Instead of being a good coach and getting the most out of his QB, the QB that he signed to a massive extension, he sends him out of town. The Lions get a QB that McVay has broken. He struggles in his first year. Dan Campbell takes over as play caller and essentially QB coach and actually coaches him up and Goff has been a different QB ever since. If McVay had done what Campbell did, they would have had a younger version of Stafford, more cap space to add to the roster, and more draft picks to add to the roster.