I think that there's a few things that he does really well. I think that those skills correlate better to playing on the guard than the tackle or center. Do I think he can play 1-5? Yeah, special players can do that and he's special. He's a three down/60 snap player which is rare on the d-line. That being said, I don't think that his best place is head up on the tackle nor head up on the guard. Head up on the center would look like the shower scene from American History X. If I'm a 43 team, I'm putting him on the outside shoulder of the guard and letting him play ball. In the right situation he lines up in the 1, and if I have leftover players from a 34 regime (Yeah, he's going to Denver) he plays some 5 in sub.
I think it depends on what kind of player you're looking for. If you want a shooter who can also lock a guy out, Dareus is a nice fit. If you're concerned with clogging passing lanes, lateral agility, hand technique and overall versatility your guy is Watt. Every year there's a Marcel Dareus. JJ Watt is a very rare blend of talents that seldom find themselves placed in that frame. Wow, I'm way too into Watt.
I thought my heart would never recover from CB, but there's a new love in town and never had the fire burned as bright as it does for Watt. I have never been more sure of a player in my life.