Shade was in the portrait between Tigress and Sportsmaster (which I guess confirms he was also there 10 years ago and was the one who attacked Mid-Nite). So far we don't really have an explanation for what happened to him and Fiddler, even though Fiddler's kid is at the school.
Interestingly, when we've seen all the Injustice Society kids, we haven't had a mention of Icicle Jr. or Hazard (Gambler's granddaughter) yet.