Young and Granderson are projected to be the starting OLBs in the 3-4. They aren’t ideal to be full time 3-4 DEs since they aren’t heavy enough to constantly take on doubles every play. They’ll get some 3-4 run with their hand in the dirt. But their skills and experience are best suited as standup rushers in 3-4.
Grando could be traded because a new definite starting OLB/edge rusher was drafted high, rather than position alignment. But a trade feels more like what we want to see happen than what’s realistic. The starters at OLB are in place.