After completing the maxxis egg I no longer hear him speak at the beginning when I build a turbine and the tower is lit up like it was post egg. This is true whether or not I'm the host as long as I start the game right from the beginning. If I jump in after its started everything is ok and we can do it again.
I've already heard richtophen speak since I completed the egg so I know I can do his side still. But are we only able rondo his side once as well.
Also wouldn't the fact that these eggs don't reset like the other eggs did indicate that we have only just begun a series of tasks.