Short route or deep route

I run a Nickel 2-4 man Blitz scheme and I’m trying to decide what’s better to have on my fs. Fs usually covers rb which most players throw short routes but some will change their play and make it so the fs covers a recieve/te. This makes it so they get big yards easily. so should I go with dko or sko

I think I would go with drko. I'd rather make my opponent beat me by throwing a lot of short passes than get a couple deep.

That said this sounds like a textbook situation for where a sub might be useful. If you have a roster spot and the coins, I'd get a player with free drko to sub in when you think fs will cover wr/te