As far as PG skills go I think Exum is somewhere in between MCW and Burks. Is that good enough to play PG full time? Tough question. Physically he is a near clone to MCW. Same height, same lanky build, same athleticism. Exum even has a 2" wingspan advantage! Watching MCW play, even though he is not a great shooter, it is a huge advantage he can get his shot off against any opposing PG. Exum would enjoy the same benefits. To illustrate my point, Burke is a better shooter than MCW, but if we have to run a screen 3 times for him to get daylight you are throwing in turnover variables which could really hurt his overall impact.
In 3 NBA games MCW is a 47% 3pt shooter. I wouldn't say he's a worth shooter until Burke proves with number he's equally capable of putting it in. MCW's number will probably shrink once teams actually realize it's only FO that tries to tank and they prepare for them. Which should be right now. But I don't know, that's a lot of laurels up front for Burke who hasn't showed his shooting skills.