Well there's two more Spurs news items that flesh all of this out.
Pau Gasol is the real top target in free agency.
The Spurs have signed two Euro stashes in Davis Bertrans and Livio Jean-Charles. Bertrans was the other pick in the Kawhi-Hill trade. Livio was the 2013 1st round pick.
Bertrans, Livio, and Murray will float between the end of the bench and the D-League and replace Bonner, Martin, and Miller with youth. If they get Gasol, Duncan will go to the bench for his last season. He and Manu will be able to help mentor the young players.
Any hope for the season will rest on the backcourt. Green has to return to form and Parker/Mills need to be consistent and reliable as 3rd and 4th options. Anderson and Simmons will be called on to do more this season and won't be on the roster in 2017-18 if they don't.