Witten got like 125+ targets year after year when he was there. Romo throws his way a ton. He was relegated to run blocking until he got to New York. I think he's a risky signing because I'm afraid his play might go in the toilet once he gets the money. I hear he is quite the character. Other than that though, the guy was the most complete TE on the market. Great blocker, good pass catcher, great athlete.. He can play all 3 downs. If he plays like he did with the Giants, he'll be a terrific signing.
Rodriguez isn't the guy you want at the Y in a West Coast offense. He's not a very good inline blocker, and most likely will play the Aaron Hernandez role as an F, where they'll move him around all over the field.