There's currently two Black Adams. One was on Bendis's Justice League, and the other is from the far future, from Future State, and was de-aged to a teenager in Shazam's last book before the current Mary one. That teen Black Adam, nicknamed Teddy, joined Teen Titans Academy in the final issue. The True Black Adam is clearly the one who was recently on the League.
I can see either Zatanna or Doctor Fate getting a solo book.