Yes. Team sport. That is the point. When QBs are under a heavy pass rush, they tend to throw more incompletions and interceptions. Those things don't tend to occur in a vacuum. There is a reason Rivers was involved in more turnovers later in his career, and it isn't because he became a worse QB.
The Spanoses in London would fail harder than they have in L.A. The NFL has lost its collective mind if it thinks that would work. The NFL might work in Asia or Mexico, but in England? Not a chance. Yea, yea. Y'all can point to sell-outs in the few games the NFL has played there just like I can point out the last time the World Cup was in the U.S.A., it was a great success. But would it work if a team needed a fan-base that would follow it over a 16-game season? No way. No chance. Not even an ounce (or gram) of hope.