...Alfred, or at least the Alfred from another Earth. This is a theory many people had based on the fact Alfred was the first "Outsider" back in the day before the Flashpoint one and in my opinion the most recent Justice League issue has definitely proven to me that is seems to be the case.
Despite not being an actual superhero Alfred always had a very unique look that made him hard for artists to make him look like some generic old manm so when I saw the man at the end of JL22 the similarity struck me right away. I looked in my collection for other instances were Ivan Reis had drawn Alfred and I have to say they really do look like the same person
Not only that, but looking back at JL19 he even has a very interesting interaction with "our" Alfred
And how do we know this was the Outsider? Because of his white skin of course!
I know this may be a little pointless to some of you since it was kinda obvious to many but I still felt like sharing what was basically a straight out confirmation about the main bad guy's identity.
And to wrap this up... OK let's assume he's from another Earth, what does this mean? I have no idea.