I believe the Suns would have to send out $19 million ($5 million less than Aldridge’s $24 million). You’re right in that they don’t have the contracts to make it work, so can probably move on. They could guarantee Kaminsky, Payne and Diallo’s contracts and include Bridges and Johnson plus add one other contract and make it work but that’s their entire back end of the roster and not sure the Spurs want any of that.
Maybe a sign and trade works around Saric, but we know sign and trades are really hard these days.