History of the DC Universe

I came across this History of the DC Universe poster that and the newer cover by Alex Ross. I thought that Black Lightning would be on at least one of them. If you look closer you will see that BL is not anywhere to be seen on either of them. How can you have a History of the DC Universe poster and not have BL on either of them. He was the first African-American in DC history to have his own self titled book. He is a big part of their history. However the Ray is in the poster on the back row. Since BL made his first apperance around the same time as the Ray did with the Freedom Fighters, perhaps I should say the Ray reappeared with the FF as they were the Quality Comics characters who appeared seperately until DC joined them as the Freedom Fighters, and both books are closely related to the DC Implosion they may have used the Ray to represent all those from that period. Still I thought Mr. Ross might have included BL in his updated version. Once I looked closer I didn't see BL there either. I would have thought he would have been in at least one of them. Yet Judo Master is in both. He is in the lower right hand corner of the poster next to Mister Miracle and Jay Garrick. What are those three looking at that has them so amused? You have to look even closer in the Ross cover. He is in the lower left hand corner as a silhouette.