He is he really that far ahead skill wise? salary wise yes, but we know that is misleading.
I'm certain there are more great 20-year-old players out there than the three or four that people have been talking about, Trickle and Rainey included. There are lots of similarly-trained players in U21 since it's mostly an arms race and there isn't much time to train secondaries on a U21 player. Because of this, game shape is incredibly significant at the U21 level. Rainey in mediocre-average game shape is a much lesser option than other U21-caliber players in strong-proficient game shape.