He alone? Nothing
What does Dib #1 even win from this?
Maybe when he ended up in that planet, he realized he could save multiple earths by trapping as much zims as possible with him, since that's the only way to finally stop him for good to conquer earth
For the training? Maybe it's all made up, only to kill/send to somewhere else one by one to avoid revolt between the most powerful Zims. maybe Tak is the number 2, hence why the cape color and the "unnecessary" burning
That also got me thinking in 2 things
Will there be a group with other dibs? Complete with their ships and beyond?
What happened with the ACTUAL first Zim? assuming he isn't dead