Here's some video on Hayward and his "average" athleticism:
http://www.youtube.com/watch?v=X4YssyOJQAc
His athleticism is below that of an average NBA 2/3 player.
He's a great athlete against every guy at the local bar and against half the NCAA. He's athletic for a white guy basically.
Again, I don't hate the kid. He's a good player. I just don't want him on the Celtics. He's not the key piece to an NBA championship. And to spend 10 million + on him isn't the wisest move for us right now. I'd rather keep Green at 8-9 million and his similar offense/better athleticism/better defense than Hayward.
A white guy that it's confirmed that Ainge loves? Chandler Parsons. I'd see Ainge going after Parsons before Hayward- but neither are real game changers for the 10 million+ mark.
Just my opinion.