Christopher is oozing with offensive talent. Man, if he puts it together he'll be a dangerous scorer. There's a bit of Nick Young to his game, an uber-talented wing who shoots you out of it as frequently as he shoots you into a game. Those guys top-out at the tail end of the first-round in my book. Christopher can be a paid assassin for NBA teams off the bench, with some starter potential. But that doesn't have much lottery hope.
Add to it the inconsistencies of his season and there's a little risk involved with him. He's likely in the 25-to-40 range pretty firmly.