So you admit the story would be different without the Arondir character present to delay Adar. Theo could have died if captured by the orcs and not saved. They wanted the sword and not Theo. The village could have burned if there was no resistance or an elf to plan it. Your arguments about teleportation clearly reveal that you would have complained about tunnels and trenches appearing out of no where. We never would have saw those without Arondir.
The creation of Mordor would be different if Arondir didn't exist. It is silly to think it would play out exactly the same with out him. Removing a main character changes a story. Skin tone however does not.