In my mind, our assets can be arranged in tiers by trade value. Ignoring players like Isaiah and Al, who simply make no sense to move at this time for a variety of reasons, I would break them out like so:
Tier 1: Avery, Jae, Marcus, Jaylen, BKN17, BKN18
Tier 2: Rozier, Rights to Yabusele, Rights to Zizic, BOS18
Tier 3: MEM & LAC 1sts, BOS19, MEM 2017 2nd (currently #35),
Tier 4: Various lesser second round picks, Jackson, Mickey, Rights to Nader, expiring contracts.
Tier 1 trade assets all have high floors and either high upside or extremely favorable contracts. Avery & Jae are tier 1 assets by virtue of both their proven high-level production as starters on a top team along with very, very friendly contracts. Marcus and Jaylen are top trade assets by virtue of being top picks on rookie deals, both still seen as having high upside. The BKN picks are, of course, the Brooklyn picks. Note that, to some teams, AB & Jae are more valuable because they are proven veterans while to other teams Marcus, Jaylen and the picks might be more valuable because of potential. But overall, these 4 players and these two picks all represent 'top tier' trade assets.
Now, as far as I can remember, I can't think of many star trades where more than two such "Tier 1" trade assets were included in the deal.
Even with KG, there were just two such top assets: The "return" of Minnesota's own 2009 pick (which would have reverted to them anyway, once they traded KG away and were thus lottery-bound) that became Johnny Flynn and Big Al. The rest was journeyman Gomes and filler.
The Shaq trade (LAL to MIA) had one future first (Jordan Farmar), Lamar Odom and filler.
Orlando got Arron Afflalo, journeyman Al Harrington and a package of tier 2-level picks for Dwight. (That trade is a little harder to isolate because Bynum moved to PHI in the same deal, which had players and picks flying all over the place.)
I like Jimmy Butler. A lot. I think he'd be a great fit on the Celtics. But I have a hard time with the notion of sending THREE out of that 'Tier 1" list to get him.
I think any package that includes more than two "Tier 1" assets is a serious overpay.
I also think that any fanciful notions about trading the BKN17 pick with protection on it are not going to fly. We are too close to the hard probabilities that the pick is (a) going to be top-4 and (b) has a well-defined set of probabilities for being 1, 2, 3 or 4. With a solid 46.5% chance that pick will be "Top 2", Chicago (nor any team) is not going to accept it with top-2 protection on it. Protection on that particular pick might have made sense prior to this season.
I think the deal that makes sense will be one of the BKN picks, one of the players from the Tier 1 list and then a package of fillers and sweeteners from the other tiers.