I'll go with Everett on offense (over Jamon Brown) because we desperately need a tight end to work out for us.
Defense is a little trickier. There's definitely potential in Ebukam and Longacre on the edge, while Westbrooks looks like he can be a dominant pas rusher at defensive end. JJ3 is a solid safety who can become elite if he takes the next step, and Littleton taking the next step at inside linebacker could help our team tremendously.
Ultimately, my pick to break out is honestly Marqui Christian. I think that spending time in dime packages will help him take the next step as a starter for us. Now, I'd hate to lose Joyner to free agency, but Christian isn't a bad option as the free safety, to be honest.