This is all fan created stuff so the separation from the series starts there alone. I was never here at the very beginning so I don't know what they did, but its been known that SL's universe/realm is different from the canon one. Or that SL takes many years after the series ended, making us the new 'era' of shinobi. But then the history is fuzzy
I honestly think there should be some sort of generally agreed and discussed 'beginning of time' for SL and how things got out into the RP realm. Given that our history differs entirely from that of the series. A prime example, would be my efforts to create Uzushiogakure once again and reunite the Uzumaki Clan, as opposed to the canon series having Uzushiogakure destroyed and the Uzumaki Clan scattered. Another good example would be the Uchiha's mass population as opposed to how the series only had 2 living one's Kay did have a great timeline going on but it stopped being updated and checked up on, which is too bad.
Usually the 'heads' or high ranking figured of a clan or village can tell what they've experienced within said faction to truly tell what went on during time and how things progressed. Otherwise, anyone's guess is as good as the other into what 'actually' happened. Lately, no clans have really banded together anymore and are rather scattered, while their blood runs a muck through literally everyone that breathes air.