I didn't see him as "a shell of himself" last year. Certainly production was down, but still had 6 games with 60+ yds and 6 games with 4+ receptions. For a team with DK & JSN, the #'s were decent. 600 total yds on 49 receptions and 12.2 avg. Not too bad. Most of those were before JSN's tear, so different perspectives to evaluate from.
He was never a burner...skill was quickness with an excellent grasp of the position. He hasn't lost the latter.
Honestly, not trying to be a homer...just think he brings leadership, knowledge, etc. If they can't get the right deal, then you have to cut him. Dude still had value IMO.