Headscratchers / Bakusou Kyoudai! Let's & Go!!

• In chapter 2 of Return Racers (the summary is located here - it's a blog hosted on Livedoor so beware of irrelevant NSFW ads), Go uses Beat Magnum (which isn't the Premium version either, you can tell that by the car's bumper) in his final race against Retsu's new Great Blast Sonic. This raises questions: what happens to the Aero duo (Lightning Magnum and Blitzer Sonic, which appears in MAX manga, at least for Lightning Magnum) and the PRO cars (Bison Magnum and Rodeo Sonic, which appears in a My First Big Special manga)? Are those cars being ignored?
  • From the look of it, it is possible that the event of Let's & Go! MAX and My First Big Special are being ignored in the new manga. Please note that Let's & Go! Return Racers! isn't the only Mini 4WD manga on Coro Coro Aniki magazine to do that, as Hiroyuki Takei's Hyper Dash! Yonkuro also ignores the event of Shin Dash! Yonkuro toy manga as well.