I think Barbatos is the Dark Multiverse almagam of Batman merged with The Spectre/Aztar. Look at the huge powerset, the way he talks, connection to the Multiverse, that cloak.. I wouldn't be surprised if the spear of destiny (FC: Revalations #3) was made from Nth metal, which can hurt Barbatos as we saw with Hawkman's mace.
Dude you are spot on. I google this topic every few months or so and finally something came up. And the second I see big eyed, mouthified, cat-faced people I get pissed. It bugs me so much that I'll skip every comic in a series until his run is over. The only time I gave him a pass was on Superior Spider-Man.
I think they're doing a "Flashpoint" kind of thing here where the kids died on this Earth-2 and the parents became either heroes or villains (i.e. Thomas Wayne becoming Batman). I still think Barry's dad is Zoom, we heard Robert Queen became the Arrow after young Oliver died, "doppelganger" variations of characters (Atom Smasher, Linda and Dr. Wells).