In all seriousness, who was the last guy to tear it up in summer league (or D-League) and then carry it over and be "better then expected" in the NBA regular season? [I don't mean, oh, Andrew Wiggens looked good in summer league, then looked good in the NBA --- that was expected.]
nerlens noel was one of the best last year and he was nearly a 40fp player the second half of the season. Kentavious Caldwell pope was great in summer league last year and carried it over into the regular season. In 2013, oladipo and Drummond shined. Olynyk was solid as well. In 2012, lillard, kawai, jimmy butler, tobias harris and klay thompson were the best players.
I take summer league with a major grain of salt, but the fact that Gordon is clearly vastly improved from last year is a good sign. Comparatively, it's night and day. Considering that he's one of the youngest players in the league and all I've read about is how he's lived in the gym all summer, it's good to see it paying off.