In the Evil vs. Evil episode, it finally dawned on me that the Bakugan who dislike the Brawlers were sent to the Doom Dimension thousands of years ago, but yet the Brawlers have never been a team or alive thousands of years ago. Of course in time travel, you can meet someone today wh0 met you in their past and so on.
Maybe I missed the explanation, but it could mean there is time travel in the Brawler's future. Who knows maybe sooner than we expect, as maybe their way out of the Doom Dimension and back home is via time travel OR maybe it is for a future season.