I also like Kirk Cousins. though I'm not sure hes really a sleeper, but hes not being drafted as a QB1 and there is a chance he should be. People are discounting him due to the Achilles injury but he is not a running QB. hes always been a bit of a statue in the pocket, so I really dont think the injury affects his game. Early in the season hes looked sharp too.
and now hes on a team with pretty close to equal talent to what he had in Minny, but hes playing behind a better line.
you give a guy like Cousins more time to throw, hes gonna be more productive. so I wouldnt be surprised if you pro rate his stats while healthy to a full season if he hits that number. if things go right, he even exceeds that number, and I'm pretty sure that's in QB1 territory.