I think Boston can make one of the best packages for KD and still have a team good enough remaining.
Something like this would be hard for other teams to beat:
Durant for Brown, Grant, Nesmith, 23 1st, 25 1st, 27 1st
Very tough for another team to beat that and it would still leave BY FAR the favorites to win the title over the next couple of seasons
Smart, White, Tatum, Durant, Horford, Rob, Theis, Pritchard with still having the TPE's to absorb unwanted salary and the TMLE to be used.