I think I understand the plot, as a veteran of this game.:
Bowser's 7 Koopa Kids died 2 years ago. Bowser jr. died 6 months ago. They were all killed by Mario. Bowser just had his wimpiest baby. To ensure he survives, he's put him on a training course for immediate escape. This way if he's near dying he'll know how to use his surroundings to get away as fast as possible!
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