Imu isn't nuking anyone at egghead.
It's clearly related to broadcast and Saturn wants to stop it before it happens
Again, that doesn't solve the problem how there are multiple eye witnesses seeing things they shouldn't.
Your argument is why they are there.
Not that them being there is a big problem for Imu cause you have people all over the place seeing a major WG secret in their arrival.
Imu nor the Gorosei can afford any witnesses here.
At this point, not a single person should leave the Egghead area due to how much danger there is of people talking about what they seen.