Problem right now is we just have too many scorers on the perimeter who need the ball in their hands, and I think that what this team desperately needs is to swap one of those guys out for Smart. I'm not the biggest Marcus Smart fan, but he'd be a perfect fit in that starting 5.
Smart doesn't need the ball in his hand to impact a game, yet he can still take and make open threes when he gets them. Having Kemba, Hayward and Tatum gives you a nice three man rotation on the offensive end, and with those 3 guys drawing defensive attention Smart should get open threes all day long, he just has to make them.
The only thing that would stop me from doing this right now is that it means putting Brown on the bench, which you just know he wouldn't be happy with, and it puts a limit in his ability to grow. He needs the minutes and needs the touches, and I just don't think he'll get them in Boston. I think Kemba and Tatum are your clear #1/#2 guys, and i just think Hayward's game suits that 3rd man role better because he has the ball handling, play-making ability, scoring ability, defensive ability combined provide him with the type of multiple-position skillset that seems perfect for a #3 guy on a team like this.