I wouldn't get my hopes up....DA doesn't tend to keep these picks.
If he does Gordon is one of the best choices left to choose from
I trust Gordon to be better than Exum
I would be very, very, very surprised if that is true.
Gordon really doesn't have any attributes that Exum doesn't have. Both are excellent defenders, both are very young, both are exceptional athletes, both have high IQ, both have good passing and ball handling skills for their position, both are good rebounders for their position. On the down side both have weak jump shots, both are sub-par free throw shooters (though Gordon is far worse), both have a major need to add muscle.
The difference is that Exum has far greater physical advantage at his positions (his size is either elite at PG, or excellent at SG). Gordon's size can be an advantage at SF, but could be a major liability at PF. Exum's position isn't as depending on strength, so his lack of bulk isn't as much an issue as it is for Gordon (who would get slaughtered by stronger NBA PF's).
Also Exum is also a far superior scorer. He can be dominant attacking the basket, he's at least CAPABLE from the foul line (around 64%) and he is a very good post scorer which (combined with his size) will make him very hard for opposing NBA guards to defend. Gordon has a far more limited offensive game and depends mostly on his athleticism to get points - he's really not a very skilled scorer at all.
The difference to me is that Exum has a LOT more offensive upside and IMHO has the potential to be an 18/5/7 player in the NBA, wheras I think Gordon's celing is around 14/8/3. I really think Gordon will be a MKG / Tayshaun Prince / Nicholas Batum / Gerald Wallace type player, while Exum will be more of a Penny Hardaway / Michael Carter-Williams / Derek Rose / Russel Westbrook type.