we just let go of Bane and Alperen Sengun for cost-cutting. Two good young players.
We traded the #30 pick in the draft (literally one pick away from a 2nd round pick) for two future 2nd round picks so that we didn't need to add a 3rd guaranteed salary rookie in one off-season. We also had just drafted Nesmith - I doubt we would have drafted a player who projected to be very similar to Nesmith, but with a lower ceiling.
Not picking on you directly, but I constantly see people saying that we traded Bane to dump Kanter, when that was only a tiny part of it. In fact, I'm pretty sure Kanter only picked up his option after he knew we would deal him to POR - a place he really enjoyed playing in previously.
As for Sengun - I much prefer the two 1sts OKC got for that pick. OKC also did an incredible job getting out of $20M of Kemba's guaranteed salary (from $73M to $53M). It's easy to see why they followed through with the buy-out. Kemba wanted out and NYK was willing to give more than the minimum, allowing him to take less on the buy-out.