What if Galen marek/starkiller killed sidious in TFU

What would have happened?

Original trilogy would become non-canon.

Originally posted by Arhael
Original trilogy would become non-canon.

Yes, but would it have been better off or worser off for the galaxy overall if Galen Marek killed Sidious? It would have saved alderaan and years of civil war.

Not sure it would have made much of a difference. Someone like Thrawn still would have stepped in and tried to assume the reigns. I believe Sidious also already had his clone replacements ready to go, so it wouldn't have been all said and done even had he been killed.

Luke would've been burnt toast.

Sidious comes back and owns him.