We all seem to be in agreement of incorporating it into a mining company, so why are people being moved to Jupiters? They'd still get those hashes when the Jupiters are incorporated into the company, but they'd just have to wait even longer to have a stake because they're on one of the last machines.

Basically, if the people on Saturn 11 stay there, they'll be getting ~2.5Gh/s per share once the 11th Saturn comes in, then ~2.7Gh/s (or whatever the total value with the Jupiter included) once the Jupiter arrives.
If they move to the Jupiters, they'll get nothing until the Jupiter comes in, then ~2.7Gh/s afterwards.

tldr people moving to Jupiters are losing out if this is to become a mining company.