They learned a number of things on this move. They learned that with the same average density, a 1500 km moon and a 2000 km moon do not equal a 3500 km moon.
They learned how difficult it is to get large moons into a close stable orbit. Planets with multiple moons have moons that are tiny compared to the mass of the planet. They finally gave up and sent the moon back to the gas giant.
The only information that I can't find is who made all these bad decisions.
They learned how to cover their tracks. They did learn something important.