They believe he has the versatility to help the defense a lot of ways, but given the fact that the 49ers haven’t been able to work with Smith all offseason, the chances of him being able to integrate everything he needs to know to play everywhere before the start of the season aren’t good.
So what could happen is Smith will start out as a nickel rush end and then maybe he graduates to playing linebacker on one side on first and second down. The more comfortable he gets, the more he’ll do.
Link

Am I forgetting someone?