And to also be fair, Roy Thomas is the one at fault for some of these. (Not the bit about the Earth-2 version of Atom not shrinking, though.)
Both Air Wave 2 in Green Lantern and the Guardian/Newsboy Legion stories in Jimmy Olsen came before Roy Thomas came to DC and created the All-Star Squadron.
And Roy did get carried away with all his Golden Age retcons for All-Star Squadron, like having all the Quality Comics characters originate on Earth-2 prior to travelling to Earth-X (where they were first introduced into the DC universe nearly ten years prior to appearing in All-Star Squadron).