Well, they were, in essence, the first character you met (Kreia was your master, and the boss, so she don't count ) so their backstorys had the whole game basiclly to develop. Unlike some other characters, who came in later, like Jolee. If he was in Carth's place maybe you could've gotten farther with him, other than his male friend (forget the name, but it's like Anders or something), and stuff about Nomi Sunrider. He was a good character, but he could've been a bit more.