Well he's on a 33 point pace so far, lower end of the predictions. He could improve as the season wares on or he could tire out like alot of rookies do, my money is on improvement but who knows really.
At first glance your team/roster looks deep enough to be able to continue to stash him and not really lose anything.
I think he should be owned 171 players deep. In your league I imagine there are a number of 30-40 point pacing d men owned.
It's too early to tell if he'll be worth keeping just like it's too early to drop him imo. I don't see him as a liability on your squad yet so I'd just continue holding him as long as possible and re evaluating along the way.