If I'm not mistaken, didn't Brad Stevens call Hayward the last time Hayward hit RFA.
Of course, it wasn't serious talks because C's at the time barely had cap space and the C's were a tanking team, but still.
Maybe Brad Stevens calls Hayward first and finds a way to lure him here lol.
My guess is, Ainge would probably take Griffin, and then the 2nd tier options.