Considering the fact that Ingram averaged 7.8 points a game in the last month of the season while shooting 34% from the field, and his 8.5 PER on the season was 328th out of 355 NBA players. I think it's safe to say "He hasn't already".
Ingram may be a fine player some day - he has great athleticism and a good frame, but right now I'm not exaggerating when saying he's a terrible NBA player.