Upon further consideration, and after reading about what Denver wants etc. (replacement PF for Martin, youth, capspace (Melo puts them into taxland), this is basically my offer (and so uneager am I that I am not terribly flexible about it): Casspi, Landry, up to 2 #1s (presumably now in the 20s and hence not that valuable).
1) Why Casspi instead of Donte? Two reasons: 1) Donte has more of the build of aplayer who could come off the bench as a do it all defnsive roleplayer. Backup Melo, play alongside him at either PF or SG. Defend the guys Melo won't. and 2) the Syracuse connection, might helop Melo integrate, and 3) Casspi's ego. I'm not sure he would adjust well to permanently being pinned behind a perennial All Star type guy. Greene seems more likely to accept that role. denver either gets a fiery melo replacemnt, or can try to three way Casspi into a market where his nationality really carries some punch in exchange for even better goodies.
2) Why Landry instead of JT. Landry is good people. I think people underestimate his importance as we are currently constructed, and losing his classy vet presence to bring in an essentially selfish player like Melo gives me the uhoh chemsitry willies. But once you have Melo Landry becomes truly superflorous -- his best trait is his scoring in the post, which is exactly what Melo brings. And a starting lineup with both Reke and Melo as well as potentially Cousins is not going to need offense or a guy who needs shots. You are better off then with rebounders/defenders up front, and JT could continue to play within himself like he did late last year and not have to worry about doing much outside his box on offense. Denver gets a very cheap Martin replacement this eyar (the very cheap mattering to them), and wiht Martin finally coming off the books, could look to resign him for next year.
3) the picks are because Denver does not want to take salary back, and I think they likely end up being #20 or later if Melo comes in good faith (and if he does not.
All of the above clarifies the SF platoon, clarifies the PF position, and probably clarifies what to do with Dalembert next year (try to resign him as a backup if he will come). There are still ways it can go wrong -- Landry and Casspi are good hardworking competiive fire guys, and if Melo comes in as anything else, a prima donna, a coast along guy on defense, we will rue the day. But with those exact moves the end result team on paper (stressing the on paper part) makes sense. All the pieces fit the roles you need from them.
Bigs: Dalembert, Thompson, Cousins, Whiteside -- 3 10rpg type guys,. 2 shotblockers, 1 scorer/passer
SF: Melo, Greene -- big weapon 1a backed up by do it all 6th man roleplayer
Guards: Reke, Cisco, Beno -- big weapon 1b in a three man rotation with two roleplaying vets who's job it is to stick the jumper and move the ball.
Its a real risk, but that team could be a threat assuming Melo is not a walking chemsitry issue.