Well if Scar survived he would technicaly passed the trial (he killed a xeno and mark his head)
But given the fact Lex saves his ass many times, then his life in the spaceship will become a hell
Every Predator on board would laught about him
Other Preds: "so where is your girl friend?"
"watch out she won't be there to save your ass in our futur hunts"
Or when he enters any room of the spaceship : "look everybody Scar is visiting us, so what, your girl friend allowed you to go outside hahahahahaha"
Other Pred: " Maybe you want me to call your girl friend to help you to wear your body armor? Just in order to avoid you block your fingers in it ,like the last time."
Scar : "Stop laughing at me
, you have to respect me ,now i have the mark on my head"
Veteran Predator: "damn! look at my head you f**ing noob I HAVE NO MARKS. When we said to mark yourself with the acid blood i though you knew it was a jock."