Just like in the WB series finale of SUPERMAN: TAS, the writers seemed to have forgotten that Highfather Izaya had put Earth under his planet's protection. So, why didn't the New Genesisians protect Earth during the Superman-led invasion? To say nothing of the Thanagarian invasion!
As I recall, Orion gave Superman a pretty good run for his money, when it came to the mistaken-identity slugfest they engaged in, the first time they met. So, what happened? Did a brainwashed Kal-El prove too much for him, during Apokoliptian Invasion #2? And, if so, did that lead to a revocation of Izaya's Treaty of Protection?
Even if that were the case,, you'd think that Mr. and Mrs. Miracle (Scott and Barda Free) would've used their Mother Boxes to call New Genesis for help during this third invasion!
That long-winded nitpick aside, I thought the rest of this episode was a great way for the series to come to an end. Thank you, Warner Brothers, for all my viewing pleasure.