@Human_the_2nd Which makes me wonder just what ARE the qualifications to be a Grand Servant? Gil is often said to be the strongest
and he's the oldest hero; all other heroes' stories and accomplishments are based off of him and/or have weapons that are based off of his treasury. He's got the power, he's got the fame, and he's got the feats, how has he
not complained about not being in the Grand Servant club yet? 😄
Merlin was rightfully bumped to Grand Castor after Solomon was removed.
King Hassan was Grand Assassin because he's literally the first assassin.
Here are my candidates for each class based on my current knowledge and exposure for Fate, not including any positions that are already filled (this is also as of the latest USA Fate Grand Order storyline):
-Grand Archer: Gilgamesh, Orion, Arjuna, and Hercules.
-Grand Lancer: Karna, Scathach, and Enkidu.
-Grand Saber: Atilla, Charlamagne, and of course Arturia (even though she's also a powerful Lancer, she's still stronger as a Saber).
-Grand Rider: Ozymandias and Achilles.
-Grand Assassin (now that King Hassan has retired): Shiki Ryougi, Cleopatra, Jack the Ripper.
-Grand Berserker: Cu Chulainn Alter and Minamoto-no-Raikou