I really like Hayward, but if he comes to our frontcourt to start alongside Horford and Crowder, the Celtics would become a historically awful rebounding team.
I'd put my money more on Paul Millsap as the C's target next summer (or even earlier this season if things go wrong with the Hawks). He and Horford worked phenomenally together in Atlanta and I think he'd love it here in Boston.
However, I still haven't lost hope that Durant could come here next summer. It's wishful thinking, but you never know.