Master of Masters

[Xickin]

This is a thread to question and discuss theories on the Master of Masters and his mysterious sixth apprentice. I know that the Foretellers themes are based on the Ancrene Wisse, where animals are connected with the seven deadly sins: Fox-Greed, Bear-Sloth, Unicorn-Wrath, Snake-Envy, Leopard-Gluttony, Goat-Lust. So, I believe I saw that the last sin, pride, would be dragon themed if we're going for the whole completion thing. Also, why is the last apprentice not present at all? Where did he/she go? And why is there no mention of him/her? I believe it's because they know that he/she is on a journey, they are trapped somewhere they cannot reach, or the last apprentice did something so horrid they refuse to speak of them.