JB's contract is 4 years, 18m per.
Dragic is signed using the mid-level.
New depth:
PGs: JB, Dragic, Burke
SGs: Luka, Bullock, Frank
SFs: DFS, Green, Brown
PFs: Barnes, Kleber
Cs: Holmes, Chriss, Boban
I'm pretty sure this avoid tax for the Mavs and gives them a really good player on an expiring at the 4 alongisde a better 5.
If OKC doesn't want to take both Bertans and Powell, just send Bertans and pay a smaller ampunt of tax while keeping Powell.