This could fit with the rumors surrounding Generation 1. A great champion will betray the Golden Age heroes and become one of the world’s greatest villains.
Maybe Black Adam works alongside the JSA to fight the Nazis, but then goes power mad and is banished by the Wizard, only to return in modern times and tries to take back his country with the help of Atom Smasher (like in Black Reign). Hawkman obviously being the hero that tries to stop him in the past and the present.
It’ll be interesting to see how they do Hawkman’s look. I’ve yet to see a live action Hawkman helmet that doesn’t look a bit ridiculous. Actually the one from Legends of Tomorrow was ok, but the actor was terrible.