I'd do this trade only if Cousins is gone.
I really hope that Petrie doesn't feel the same way.
I think we all agree that having a younger, cheaper Cousins is better than a potential-injury hampered, large-contract Al Jefferson.
The thing is, Minnesota is the one team who might make sure that Cousins is in fact gone. From their perspective, if they felt they could get rid of Al's contract while getting both Cousins and Johnson, wouldn't they do that in a heartbeat?
I know I would.
So I don't think there is anything to this trade speculation. If Kahn ends up selecting Cousins because he thinks he can force a trade with Petrie, Petrie should just respond by taking Wes Johnson. The Kings get the BPA, and if Kahn wants a trade it will be Cousins for Wes Johnson, not Al Jefferson for Wes Johnson.
I'd rather take Wes Johnson and play him at the 2 spot, then let Kahn back me into a corner with a trade that really helps the Wolves and doesn't do that much for the Kings.
That's how I'd play it out if I were part of the Kings FO.