Ainge could have also traded for Butler or George in 2017 on the cheap without giving up the #1 pick.
Use max money slot on like Paul Millsap. Better than Gordon Hayward's corpse. 
Hayward didn't become a "corpse" until long after he was signed--after the injury. When he was signed, it was welcomed here and elsewhere. Ainge just had some bad luck with that injury. Like the Warriors are having bad luck with Durant's calf injury. The difference in the series. Most people wouldn't give the Raptors much of a chance with Durant and Thompson healthy. But so far, they have lucked out--which often happens in the playoffs. Not that they haven't played well. That GM of theirs has made Ainge look like an amateur GM. Trading for Leonard and then picking up Marc Gasol down the stretch while Ainge was twiddling his thumbs. With the help of unlucky Durant, that GM may have parlayed those deals into a championship.
Ainge was on a role for awhile. He didn't screw up the Brown pick, handled the Tatum draft very well, successfully recruited Horford, got Hayward to come here just as it looked like he was about to enter his prime and then swung the Kyrie trade, which no one was complaining about.
Then it all fell apart with one Kyrie pass 5 minutes into the first real game these guys all played together.
Every NBA team is one significant injury away from disaster and unfortunately this proved true with the Celtics.
Unfortunately Danny's roster building moves since the Hayward signing haven't been anything to write home about and when you compare this season's moves to what Toronto, Milwaukee & Philly have done, he gets an F.
Ainge has done a very good job overall as C's GM, but he needs to do a lot better than he's done the past 12 months.