I'd be all in for the Zinger. I'd prefer him over Butler or any of the other mid to late 20's stars that have been mentioned. His talent, size, skills, and age fit in perfectly with the youthful core being put together here.
Anyone who thinks a single lottery pick, with a role player and fillers, is going to cut it is sorely mistaken. The Zinger will likely cost as much, or more, than Butler will imo. I think the #3 this year & one of the other potential lottery picks (either the Nets pick or the Lakers/Kings pick) will have to be part of any deal. Among other things.
If the Celtics could preserve the Nets pick next year, I'd send the #3 and the Lakers/Kings pick, with players and fillers. Be that AB, Crowder, Smart, the rights to Yabu, etc... No problem. I'd keep Jaylen, or sub Jaylen for one of the lottery picks.
Overrated or not, the Zinger is a hit while the future lottery picks are still gambles. A big man with his skills able to play at a high level in todays NBA, at what, 20 years old? He'd be the #1 pick hands down in this draft.
Maybe something like #3, Lakers/Kings, Rozier (or Smart), the rights to Yabu, and a future 1st (Celtics '18 or Clippers '19).
If taking on Melo would soften the cost I'd do that too.