New York cannot legally trade its 1st this year because they did not have one last year and have so few in the future. Unless they trade back for multiple picks and weaken the value of their best selection, they are out of the discussion.
The Lakers' pick is also mired in obligations. They have to hope that their pick falls within the top 5 to even enter DMC discussions. Let's be nice to them and say that it does. Since we're being entirely academic, I'll compare a Celtics offer with theirs:
Cs trade 16, 28, 33 and absorb Lance Stephenson's deal for Charlotte's #9 selection.
#9 < #4 or #5.
Sullinger = Randle (Sullinger has shown All-Star potential while still relatively young and just needs to move beyond his injury red flags. Randle meanwhile has similar injury red flags and we don't even know what his game will look like in the NBA. They are equal because Randle has a better contract).
Olynyk > Clarkson (I like Clarkson a lot and think he'll be a good player, but no one is valuing Clarkson based on his statistical performance because of how bad the Lakers are. Olynyk also plays a more valued position/role in today's game while Clarkson's contributions can be matched by a player on about 4/5s of the league's teams.
2016 BKN 1st >> 2016 LAL 1st (probably the one SAC would choose, and if the Lakers got Cousins, I doubt their pick would even be close to Brooklyn's)
James Young >>> nothing
We have a better offer and it's not even really close. To me this is a case of Celtics fans perceiving the grass being greener on the other side -- particularly in LA and NY -- and marginalizing the potency of Boston's assets in comparison. This also does not account for the Lakers' concerns about DMC leaving or clashing with Kobe.
Again a team that so recently burned by a moody super-talented big man. Zero chance Philly makes that move. Embiid's value is as low as it will probably ever be right now. They will not give up 2 potential superstars and a pick for a guy that could demand a trade in less than a year.
And another team whose wounds inflicted by a superstar big man have yet to heal, and whose assets are being overvalued. Dieng is a fine player, and probably a starter at the peak of his career, but the only thing we'd hear on this forum if he was a Celtic is "He's already 25." Sullinger and Olynyk -- because of age, but also because of talent and production -- are easily just as valuable as Dieng. While Sullinger plays the least valued NBA role of all three said players, he's the youngest and has been the most productive of all three by a long shot. Olynyk doesn't bring the defensive presence Dieng does, but he has the ability to play a role as offensively appealing as Dieng's role is defensively appealing. He too is younger than Dieng. So we're giving up two guys as valuable as Dieng (at least), the ability to trade up and offer SAC a top ten pick vs. their top 5 pick, a future 1st that is far more valuable than any 1st that a Minny team with Wiggins/DMC can offer (they can't offer their '16 1st so I believe the earliest one they could offer is 2017) plus a prospect that, while not as appealing as LaVine, certainly still holds a lot of value (James Young). If they offered up Rubio -- which I'm not sure they'd do -- their offer would be equal with ours, but in that case, Sacramento would go with the offer coming from outside the Western Conference. Another thing to consider is that Cousins would much rather live in Boston than Minnesota, so conferences aside, I think we can assume we'd get the tiebreaker because of that.
Orlando is the only one that scares me and they as well have fresh memories of Dwight Howard's 2012 fiasco. I'm also not sure if Orlando would give up what you are suggesting. If they did, they'd easily have the best offer, but by that logic, if we gave up all 3 Brooklyn picks, Smart, Young, etc. then we'd have the best offer. Ultimately I think Orlando bows out because of concerns about appeasing Cousins. Their unstable coaching situation really hurts them. Now if they can land Thibs, we may be in trouble...