Because GQuuuuuuX's Challia bull is a shitty reference character. Khara needed to scrape some material from his novel version to expand his character but after adding all their own material to him they made him this show's version of Destiny era Athrun Zala. A character from the "old show" the writers desperately want you to respect, so he says random cryptic bullshit that's incomphehensible to other characters that is supposed to be deep, He gets a contrived fight with the boyfriend he was looking for, and he's otherwise a completely flawless pilot who hogs screen time and does things that really the protagonist should be involved in