You can say that about a lot of the team at the moment. I think the overall drop in confidence is hurting some of these players - Riki too, notably. I thought Hethrington went alright against the Dragons, he was running good lines off Billy early and making some metres around the ruck. I'd back him to come good when we're closer to full strength. Having seen what he is capable of, and assuming he's on a modest contract, I definitely wouldn't be moving him on.
The sting has gone out of his defense a bit, though, which is unfortunate.