I think Overshown will play one of the middle LBs. EZ is built like a 3-4 DE and Clowney would be an outside as weill.
We nede to replace a bunch of players on the back end of the defense already, so it's not a bad year to switch to more 3-4 given we can find players for the scheme and have solid DTs that can play DE in the 3-4.
One more idea is to bring in a full-sized nose and rotate QW (303 lbs), Clark (313 lbs), and Osa (280 lbs) at DE. Keep in mind that Clark sees himself as a Nose and is the biggest of the 3 (313 lbs), so I'd picture him lined up at nose.