You sound like you could beef up your QB with Rapistburger out of action for an unknown amount of time. However Ive not played with defensive players, as opposed to teams. How will losing Watt affect your D? Can you handle it with what the FA pool has? Can you trade for D? If you can answer these questions then it should seem easy to see if theres an upside to what your giving up. No need to get worse in a trade.