Amalgam Universe/Headscratchers


 * I heard that Amalgam-related events were supposedly canon for both Marvel and DC (though for obvious reasons they could never mention them in their personal comics). And there is JLA-Avengers, which is also supposedly canon for both of them, but the two things aren't canon to each other. I understand the real reason is most likely that Kurt Busiek didn't want to deal with this stuff, but I wonder, if there exists an in-universe explanation?