I'm a bit skeptical that Pickens would bring back a 2nd. I could see it, but I could also see being underwhelmed with his return. If he does, I could get behind a WR in R1 and DL in R2.
If they do that, though, they're setting it up that they'd almost have to sign a significant piece on the DL next offseason or the following, depending on Heyward. DL can take time and who knows much longer Heyward has, especially at this high level. I think Benton is a good piece, a guy this year in R2 could be a good piece, but you need an anchor.