I'd bet moving Richardson wouldn't be an overnight move but something they'd ease into like an old man into a hot bath.
In the past they've blurred all those lines. Chillar has played safety in certain looks, Woodson has played linebacker at times, once in a while we've seen a 4-4 split type formation with a safety at the Sam linebacker position. I could definitely see Richardson making it onto the field in those kinds of roles and eventually stealing snaps from our ILB in passing situations even without bulking up. If he outperforms our guys its easy enough to bring him in next year at 230 and expand his roles even more.