That is the minimum it would take to get him. I think the Kings, if they were willing to deal him, would at least consider that package. I think the would probably negotiate throwing in one or our other worse salaries instead of Ben and Omri, but whatever.
I would assume that trading the pick swap actually means the Celtics are trading their first round pick to the Kings which carries with it the ability to swap it for Brooklyn's pick. I can't imagine it works another way.
IF the Kings decide to trade Cousins, this is a somewhat reasonable deal.
I would ask for Rozier to be included. I'm not big on Smart and would rather have a PG prospect that the Kings would have on a rookie deal for two additional seasons instead of Smart who they'd have to decide whether to re-sign after next year.
I'd also insist that Afflalo go to Boston rather than McLemore and Casspi who are free agents this summer. That would require Boston to throw in Jerebko (who is an ending contract) to make the salaries work though the Kings could agree to waive him and he could likely return to Boston for the remainder of the year.
That sort of deal (along with trading Gay and Koufos for whatever they might fetch in terms of young players and/or picks) would certainly leave the Kings in a position to keep their pick this year meaning they'd probably end up with a pick in the 1-5 range and another in the 6-9 range.
It also means they'd almost certainly have another pair of lottery picks in 2018 before having to give up their 2019 1st rounder to Philadelphia.
Is that good value for Cousins? No, not really. The Kings have had 10 lottery picks in the last decade and only one of them gave them a star player - Cousins. One became Tyreke who showed a lot of early promise but the others have been rotation players (Hawes, Thompson, McLemore, maybe Cauley-Stein) and busts (Fredette, Robinson, maybe Stauskas). That says more about the Kings poor drafting than anything, but it also highlights that the Kings could trade away maybe the most talented player they've had in the Sacramento era and end up with nothing to show for it but Rozier as a decent PG.
It's also why I'd rather see the Kings take one more shot at building around Cousins before throwing in the towel and trading him. But of course, if they wait until next year's trade deadline and Boogie has decided he's ready to move on after the season, the Kings would get pennies on the dollar and go into the 2018 offseason with a lot less chance to rebuild.
It's a gamble either way. And not a good gamble.