A Case for Case Keenum?

I have Luck and Keenum on my roster. Luck plays in DC this week, weather not looking ideal, Redskins defense is looking pretty good. Keenum plays at home in perfect weather, got off to a solid start, has a fantastic matchup against the Raiders.

Luck got lit up last week by Cincy’s defensive line, DC also has a solid defensive line/pass rush. Luck has plenty of upside still, he should be throwing as his defense is mediocre at best and Washington can put up points.

Is it a really crazy idea to play Keenum for the guaranteed floor instead? I have had Luck a few times, he has some atrocious games each year, gut feeling is telling me this is one of them.