He shouldn't need to get goals or assists, that isn't his game.
He needs a proper role though, go and ask Delph what his job is in our team and I reckon he would struggle to answer it. You don't have Oscar playing holding midfielder for Chelsea or Mikel as a box to box player, we need players around Delph that can compliment him and let him focus on doing certain things. I said earlier he is having to try and do everything and being just okay at it, where as he needs to focus on certain aspects and become brilliant.
This is what makes me question Lambert as a manager as I dont think he knows what he's doing. How would I help Delph? Get a proper DM/Tackler in and then the much needed no.10, attacking flair player.
I think Delph is much like Ramires, same kind of build, both pretty quick, good tackle and tracking but aren't as good at passing/shooting. Problem is he has KEA and Westwood next to them, and I dont know what their roles are either. It must be the most unbalanced midfield in the league.