I don't think it's McVay. IMO, it's Stafford.
Stafford has always gotten locked in on his top 2 options. He's never really been a spread the ball around guy.
That’s part of it, but I do think it’s McVay too. In the end, the buck stops with him, and if QB1 is too focused on his top 2 options then he needs to be coached to spread the ball around more.