I could see where Ainge might want to add Butler and Hayward but not George and Hayward. If Danny and manage a Bradley/Crowder some first round non-Nets picks that gives the Celtics two years of a relatively cheap Butler and remives the need to extend Bradley.
Then next year, depending on Fultz' development, perhaps the team lets IT walk, extends Smart on the cheap and gives the team PG duties to Fultz in 2018-19 keeping the team in a good financial situation that year. Then the C's can give Butler his max after that 2018-19 season and the C's go forward with Brooklyn 2018 pick in his 2nd year, Fultz and Zizic in their 3rd year, Brown in his 4th year, Smart, Hayward, Butler, Horford.
I think thats a financially acceptable long term solution for winning now and down the road.