This is a reasonable issue, but the classic 90s anime fan in me loves over the top power up stock footage
I assume you meant "same plot." While I found this true of episodes 3 and 4, I thought 5 began introducing us to more shaking up of the formula.
Namely in how Aaron didn't need the Nexo Power to best Whiparellla.
You would rather they focus on an entirely new cast every episode?
I fail to see the issue with world consistency
Based solely on the sets, it would seem that Beast Master, Lavaria, Magmar, and the other Lava monsters will be recurring throughout this season. After all, we didn't even see his Chariot in Beast Master's episode, so it stands to reason that he will return.