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Interesting to bring to play but some are also speculating if this could actually be a new Batman movie that isn't Part 2 or even the Andy Muschetti Brave & The Bold. The reasoning for the latter seems to be more due to the element of the Muschetti's potentially shifting gears to focus on Attack on Titan.
Secret 6 would be a genuinely interesting ploy. Especially if it means them a means to explore and build the villainous side of the DCU with a established base.