I will never turn down the first overall pick, but getting a max free agent (of the Hayward and Griffin vintage) just became much more difficult.
If we let all the free agents/non-guaranteed guys go, dump Jackson, and convince Yab to stay overseas another year, we're at $28.8 million cap space, $1.5 million short of a max. Even also moving Rozier would not create enough room.
If we instead keep Olynyk and trade Bradley (along with everyone else described above), they're at $29.9 million cap room, still about $400k short. Moving Rozier in addition would work, but if you want a max player, get ready for some sort of significant trade.