LOL, ok lets keep it in perspective.
18 catches for 291 yards and 3 TDs doesn't seem like much.
However, considering that the Seahawks leading WR in 2012 was Sidney Rice:
50 catches for 748 yards and 7 TDs
And the Seahawks No. 1 TE was Zach Miller:
38 catches for 396 yards and 3 TDs.
18 catches for 291 yards and 3 TDs is pretty solid on this team especially for a No. 2 TE.
Anthony McCoy is replaceable, yes, but considering he was entering his third year in this offense, his 4th year in the league, and that he was improving each season, the Seahawks would definitely be a better team with McCoy. McCoy's blocking is much better than Willson's and hes a better receiver than Kellen Davis.
Sean McGrath is vastly overrated. However, Anthony McCoy is not. McCoy would have been an asset in 2013 especially in the Red Zone, he would have made the team, when McGrath did not, and he would have been TE2 over Willson.