I remember reading that they were pretty happy with Spence before the injury, so much so that they expected him to contribute immediately. I could be wrong on that but I swear I remember reading it. However you are correct. A LOT of variables involved with Spence AND it can't hurt to add a guy like maualuga. If they could do it, it could be a Farrior like signing.
True but Spence's injury will probably cost him a potentially great career. I doubt he can get all the way back in 2013.
Playing Fantasy Football does not qualify you to be the in the front office or on the coaching staff of the Pittsburgh Steelers. They are professionals and you are not!