My bad, Clegane, in attendance, is literally appointed the second after Selmy storms off. Meanwhile, a two handed Jaime Lannister is present, who is also acknowledged as one of the greatest swordsman in Westeros. So again, IT WAS A BOASTFUL CLAIM.The five mentioned did not include Sandor Clegane, he wasn't appointed to the King's Guard until after Barriston left. As I've noted, even in early seasons Daario, Grey Worm, and Jorah easily dispatched nameless soldiers who out numbered them 3-to-1, followed by an immediate 5-to-1vattle where they were barely scratched.
As for the rest, you're comparing a scene from the tv series that was based on the book, nearly word for word, and then comparing it to another scene from the tv series where D&D didn't follow the book and did their own thing, which is the reason the show ended up sucking.