Remember though that Tyrant was the FIRST being created by Galactus. Galactus created Tyrant to be his equal. He created Heralds to be his subservients. Most likely he learned about how fubared he was not installing a kill switch in his heralds... so he installed one... just like Google did in its new g1 phone
__________________ Quotes from Hia8:
"I claimed that the science is sometimes faulty."
"You don't understand. This is fiction. That means none of this stuff really happened."
"There is no writer to purposely ignore a character's natural ability just because it suits the story."
"in some cases because the writer knows that Character A will dominate Character B easily and refuses to allow this to happen for the sake of the story."