I think Norris is worth more to us than he is in a trade, our vaunted center depth isn't really showing the signs of life needed to make Norris expendable, and moving him now would only serve to alleviate the risk of a future injury that may never come while making us a worse team.
The play with Norris imo is to let him prove the injury concerns are in the past and then consider moving him if Pinto or Greig show they are ready to take over.
If we need to move someone to shore up another spot, Greig is probably the piece, he's still got the upside people want to get a decent return, and will need a new contract that maybe we aren't ready to commit to. Not saying I want to move him, but he's the guy I think gives us the best chance of improving the roster without getting ripped off.