Quotebut all things measured as they should be, no other Predator has ever displayed the level of skill Scar has.
Well, they proved themselves in other cases, and since in hunt like Scar was present in never occured in any of earlier predator movies, stating none of his predecessors displayed any skill like that does not deny at all they didn't have that skill. Cannot be compared on this ground. Though as mentioned before, the trophy cabin in p2 is a good stepping stone...
Also Scar was aware of the ambusing alien, saw it before it could start its attack, in that I see no speciality... also not in shooting of aliens with plasmacaster. Fighting the queen I agree he stood his ground well.
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My best guess is that Pussyface used a combination of traps and ranged attacks to take down his more dangerous adversaries, the Alien he fought included.
And what did Scar use?
He fought not asingle alien in the movie face to face...
My guess is that city hunter didn't own the trophy wall. Even if commentaries say so. He wasn't experienced enough, and he seemed totally like a beginner, or being on a trial. But the alien skull is there. Someone took it. Someone from that hunting party, and that one hunter posesses more skill than Scar, if we're talking about fighting aliens and skill. Because that trophy is for the whole ship, the whole company that was there, something important, not a kill for trial.