Nick's on probation.
Cate let us know the other day that due to his "fraternizing" with Explorers, he won't be allowed to visit the Cavern for a few weeks. I assume this is in regards to his pseudo-dating relationship with Sydney Austin, but who knows. What it means is that he's going to be much harder to get a hold of, and he's going to be much harder to get information out of. That's not going to help things.
However, it seems Sharper is back in the Cavern, doing "recon" as Cate referred to it. I'm going to have to track him down.