When I heard Ferentz say specialist I interpreted it as he is a good receiver but less than stellar at pass protection and run blocking. He was contrasting him to his other TE that is doing both of those things and still making big catches in the passing game. I guess I don't see the issue. If a guy can't do what you need and another guy can the guy who is doing it all is going to get snaps and the other guy is going to get the scraps.
Kudos to Kirk for not going all Fran on the reporters who are asking him about it.
It's not a play in game!
Being more stable than Mad Fran is not exactly a resume builder.