Klein has his own guild why would he join them?
In the end, they only accepted two additional members. Why? The biggest reason is that most elite players have already promised to join a guild or are with their friends. And since the selection criteria were high, their friends might have failed.
Anime & Comics · Zentrexia
the first time the trapped was mentioned on the anime was already at the 74th floor it just the 10th who would think that it be there
He was unsure whether floor 10 of the SAO anime was the same, but the 10th boss room here had the trap. After he entered and found out he could not run away, he fought the boss alone. The boss here was a samurai named Kagachi the Samurai Lord. After fighting him alone, Kotton discovered that he could now fight a boss solo.
Dimension Lobby
Anime & Comics · Zentrexia