If we draft another guard we are presumably looking at something like
IT
AB
Murray/Hield
Smart
Rozier
That's absurd.
At that point you have to at least try to trade Rozier for one of the decent bigs last year. Ainge fudged up the Portis thing and you can't get him for Rozier now and the Bulls probably wouldn't want him anyway so maybe you could get Jarell Martin (seeing how Mike Conley goes to free agency), or maybe Montrezl Harrell (the Rockets have enough bigs), or maybe Larry Nance.