Defense wins championships but so does the run game. If you were going to trade away any aspect of the offense in terms of who's providing value for money and could be replaced it wouldn't be Forte it would be Marshall. But no way should that happen. If the Bears and Colts were talking about Forte I think it would be along the lines of 'wow are offense would get a huge boost with Forte in it'. To which the Bears guy would say 'yeah I reckon our defense could do with a young Mathis coming along right now'.