If Exum is really a star, it won't matter what position he plays.
Kobe, Lebron, Jordan, etc. where basically all PG's who played with other PG's. You want your star to handle the ball and you want the other plays to compliment him. The only thing that worries me about Burke is defense, but I like his floor spacing and ability to not turnover the ball. Trading Burke this early would be dumb.