This has got to be centeed around getting both Hayward and Butler. This deal makes it easier to get a max free agent, so maybe they have a good feeling on Hayward coming.
Also, now you have more assets to offer for Butler. Trade #3 pick plus Bradley/Crowder/Rozier and a 2019 pick for Butler?
Left with a top 6 of IT, Horford, Hayward, Butler, Smart, Brown plus a ton of draft picks in 2018 and 2019.