I think JJ is not on the "untouchable list" but I really doubt he's viewed as "fodder". Maybe it's semantics, but I don't see JJ getting moved unless the Suns think they're getting something of high value in return, opposed some of the other guys you mentioned, TJ, Melton, Okobo, those are guys I can see being moved in all kinds of scenarios.
And I don't think Oubre is viewed as a priority. IMO, he only returns of we've settled other questions first, and if we lose him, it is most likely for nothing, sign and trade scenarios seem unlikely with so many teams under the cap and the Suns almost certainly not wanting to take on salary commitments in an Oubre trade.