Thomas 33 MPG, Smart, 20 MPG,
Butler 33 MPG, Turner 20 MPG
Durant 35 MPG, Crowder 25 MPG
Sully 20 MPG
Horford 28 MPG, KO 26 MPG
The problem with this (admittedly lovely lineup) is money.
In the above scenario, you may be able to get Butler by sending out matching salary, say, Avery & JJ's contract and other filler. So that maybe doesn't raise your salary, but it doesn't help you cut any, either.
Durant & Horford are going to cost on the order of 50M. We can clear up that kind of room, but not if we try to keep Evan at anything more than pennies. And we'll have to let go of or trade away anything that isn't tied down. Amir, Zeller -- both gone. We'll have traded away one or two of our first round picks, so those cap holds would be gone.
Let's assume you unload that third pick and you stash any remaining 2nd round picks. So with Butler, Isaiah, Jae, Marcus, Kelly, Terry, Young, Mickey & Hunter you are at around 40M. So now you add in Horford and Durant and you are up around 90M already, leaving just around 2M of cap space.
Sully, assuming his cap hold doesn't get in the way of signing those guys, can be re-signed later, even if we go back over the cap, because we will have Bird Rights. We won't have Bird-Rights on Evan.
To re-sign Evan for anything over 4.4M (early bird exception), we'll have to use cap space or the Mid-Level Exception (5.6M). And we wouldn't be in a position to know we would be able to do either until _after_ Durant & Horford finalized their decisions. If David Falk gets an offer for Evan at anything over 6M, he can't wait around for Danny to clear up his business. He'll want to get his client signed to a job.