Well, how I always looked at the 52 verse is that multiple universes were pushed together and that's what we have now. The stuff that happened in Batman previously still happened over the long time it did, but now they only remember it happening within the past 5 years. Like, it actually happened over lets say 10 or 15 years, but when the different universes were merged together to create the 52 universe, the 'apparent timeline' became 5 years, though in actuality it was longer. Or at least that's how I look at it, less confusing that way...
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