With no trades, then free agency would be key.
If Danny could sign Horford and Batum for 4 years, and somehow move up from #16 with Rozier and other assets to get to 5 or 6, he could draft Brown and Chriss.
In 4 years, let Horford and Batum walk, and then Brown and Chriss are 23 years old, new contracts signed and ready to go.
The key is getting to 5 or 6. Trade Amir, Rozier, 16, 23, and if you have to Olynyk (prefer James Young) to either Minny or NO and take back Asik or Pek. Its a lot to pay to move up from 16. Taking on a bad contract isnt horrible with the salary cap going up so much. Both NO and Minny could use rozier at pg.
Horford Mickey
Crowder Chriss
Batum Brown
Bradley Smart
IT
Getting to 6 works really well. Even if Chriss and Bender go 4 and 5, you can take Dunn at 6 and still have a trade to philly available. If Chriss and Dunn go 4 and 5, then you can take Bender at 6 or possibly trade back down for one of the other bigs likely to go in the 10-12 range.
If getting to 5 or 6 doesnt work, surely getting to 10, 11, or 12 using 16 and 23 could work. Skal, Poeltl, Ellenson, or Davis might be good fits.