How about this overall scenario:
Rudy & Danny & Joff opt out. Manu retires. BP3 waived. SA clears the deck on all their cap holds (give or take 1 or 2 players with small holds).
SA trades LMA to PHX for Josh Jackson - PHX is trying to win now and they seemed to like LMA, this allows SA to shed salary but also get a young wing Kawhi replacement.
SA trades Kawhi to LA involving MEM for Ingram + Parsons + #4 + #25
So SA clears the deck on everyone except Murray, White, Pau, Mills, Ingram, Jackson & Parsons. They have picks 4, 18 & 25.
You can either package picks to move up or stay put and try to get something for Mills if you can.
But core is now Murray, White, Josh Jackson, Ingram and 4th pick (say Jaren Jackson Jr or Mo Bamba).