Exiles Hyperion killed Galactus in his own timeline, but we dont know how powerful Galactus was at that time, while Tyrant has stalemated a nearly full-power Galactus. And dont say it was just Exiles Hyperion boasting cuz it wasnt cuz if he was just boasting how come the planet he was ruling was only full of bodies? how come u didnt see Galactus walking around or whatever? i think he really did kill Galactus.
Armando. Theres no evidence whatsoever that backs up Hyperions claims. If he claimed it and then was shown pulling off skyfather level feats then maybe people would at least entertain the idea. However nothing about his appearances indicate he's at a level of power sufficient for him to have been able to fulfill his claims. Therefore you can only go by his showings on panel. Tyrant is overkill.