Could be wrong, but if the Celts want to make moves, I don't see how Lebron, Bosh and Melo's lack of decision affects them.
The only area I could maybe see with Minnesota, Cleveland and Kevin Love.
If Lebron goes to Cleveland, then I could see Minny trying to pry Wiggins for Love so the Cavs have a super trio of Kyrie, Bron and Love.
If that doesn't happen (which I don't think it will) then maybe Saunders takes Boston's offer more seriously.
Other than that, I don't see how the decisions of the big free agents should impact the Celts.