Thread:JeloElducal/@comment-30384301-20180803133315/@comment-27480112-20180809050254

Here are the reasons as to why the BRG can't come from the main IaLRverse. Basically all of these are the possibilities that Resound River could be discovered way early before the story, if it was there in the beginning.

There's more, but I can't tell them all in one post.
 * Not all LRG members live in/come from Echo Creek. No, I'm not talking about Starcade, the Gemstones, Star, Kyoji, etc. I'm talking about those who live OUTSIDE Los Angeles. I'm talking about the Murphys (Milo, Martin, Bridgette, Sara) Melissa, Zack, the Flynn-Fletchers (Phineas, Ferb, Candace, Linda, Lawrence), and the Louds. Consider the fact that Resound River is located near Echo Creek. Now, on their way to Echo Creek via cars, they could probably enter Resound River on their journey (depending on which route they take). Once they get to Echo Creek, they'll inform the other Gang members about Resound River's existence way before the events of TBRG even started.
 * Quixel and Mizuki are a BIG anomaly. If Quixel did live in an area somewhere in Eitbit, some lost wandering Eitbitizen could meet with Quixel. Once he goes back home, he could inform the Retro Rebels about Quixel's existence before TBRG's events started. Next, the Ice Sensei could inform Kyoji about Mizuki's existence. You could solve this by saying there are two seperate Ice Senseis, but in my headcanon, there can't be more than one Sensei and one Dojo for each respective element.