Pau's almost certainly not getting traded after the season. His partial guarantee loses all value after the trade deadline under the current CBA. If he is traded, it'll be as a salary dump, likely costing SA value rather than as part of a package for a useful player. Pau's value is mainly that a team could send out worse salary for him now and waive Pau before July to save on the difference. Someone like Kent Bazemore might be a fit under that scenario.
However, after the deadline, Pau's outgoing salary drops to $6.7 Million, making him unable to garner an expensive matching deal. The other team also has to be able to take the full $16.8 Million to complete the deal, even though they are only able to send out $10 Million or so. That imbalance makes finding a deal much harder.