Pretty much my thoughts. Thanos and Darkseid exchange views and Thanos offers his talents in Darkseid's affairs then waits for the s##t to hit the fan. Then he takes everything.
Lucifer doesn't acknowledge the existence of Black Adam, because he has no need for him.
Thor beats the shit out of the Joker.
Darkseid and Thanos work together for a while, the whole time each is plotting how to backstab the other. If that counts in any way as two personalities getting along, then they win.
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"And then there was nothing. A once broken something now void.
And on the first day, Doom spoke... 'Be.'
And then there was life."