Washington
John Wall isn't going to come cheap, both in regards to the cost of the trade to acquire him and the cost of his contract. He has one more season on a "reasonable" $19 million, before his deal shoots up to $37.8m, $40.8m, $43.8m and $46.8m - this is excluding this 15% trade kicker. If we did a deal for Wall it would likely include multiple first round picks, at least one young talent (Isaac or Gordon), and possibly one of our better veterans (Fournier or Simmons).
Milwaukee
I suppose we could offer them Biz, he's got two seasons left on a $17 million deal the second of which is a player option, but I don't see a deal that works for both parties. We'd probably have to take some combination of John Henson, Tony Snell, and Mattew Dellavedova, which is not very appealing.
Miami
If a team like Miami have cut his minutes and his role like they have, and their head coach Erik Spoelstra has apparently had issues with him, then that is enough for me to not want Whiteside here in Orlando. Their head coach is well respected around the league and not known for butting heads with players, whereas Whiteside is known to have a questionable attitude. I don't want a player like that here unless they are special and Whiteside isn't special. Miami started to adopt a more modern style and that led to a reduction in Whiteside's minutes. If we want a modern style basketball team, Whiteside isn't the guy to bring on board.
OKC
This team could be in a tough situation if Melo and PG opt out and leave town. The deal would need to be centered around them removing protection from their 2020 first round pick and possibly including another pick since they are fairly light on ascending talent. I wouldn't mind adding Adams, but his deal is fairly costly and we should ideally be taking on expiring contracts and trying to rid ourselves of burdensome multi year contracts to maximize cap space.
Portland
The issue in Portland is that Lillard and McCollum's contracts are feature hefty cap hits for the next three years. I would prefer adding Lillard because he could be our point guard but it would be a costly acquisition. Much like any deal for John Wall, it would need to include multiple first round picks and some talent. I don't see a deal working out well for us.
Spurs
I could see us trying to do a deal for Leonard, but we would arguably need to send Isaac or Gordon to the Spurs (this isn't a major issue since Leonard and whoever is left can start at the forward positions) and at least this year's first round pick. It is likely we would need to send another first round pick and possibly another talent like Fournier to even up salaries and give them someone that can help them remain competitive. One issue here is whether Leonard would want to come here and stay here, and the other issue is whether we believe he can stay healthy enough to build a contender around.
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For me, I do think there are potential trades to be made this off season but I suspect we are more likely to be looking at salary dumps for draft picks than making significant moves to reshape our roster.