I think this is where Moore shines as well. He's one more 6ft, 200+ lbs target that has to be covered.
But for the original question, I think it's TE. I think Watson still has a year or two left in him. I think he, Williams, and Gilmore could all be starters for other teams. That's three guys when usually we'll only need one, and doesn't include Pitta. It could be the rookies step up and prove me wrong, especially on one of the lines. But for now, I have to say tight end.