Why?
Phi saves money now and in the future. They bring their current payroll low enough to offer a full MLE contract to further upgrade the team all while bolstering their bench and shooting.
OKC consolidates 2 picks into 1 and helps facilitate the deal.
Dallas gets a starter by taking on more long term money.
Dallas then uses the 34 and 23 to either move up in the draft and offer the 1 pick and our TPE to Sac for Holmes, or the 2 picks and TPE for him (whichever they prefer).
Dallas offers Hartenstein the TP-MLE.
Dallas resigns JB for whatever it takes ($22-25M starting)
Luka/JB/DFS/Harris/Holmes SD/Green/Bullock/Maxi/Hartenstein