[Question] BG9, Robert and Shaz's powers?

[AizenSosuke]

Basically 2 of them have letters, but no info about the powers. Shaz doesn't even have a letter since all are used.
Lloyd bros got same cos twins. Bach and Uryu got same cos Yhwach is the king and Uryu survived Auswählen. So no lettets left for Shaz.

Why doesn't he have a letter? What is BG9'S 'K' letter? What is Roberts(Old man) 'N' letter?

 

[Forbidden Tale]

Shaz has Schrift as well. He said to Akon: "I am Shaz, His Majesty blessed me with ....." and than Ichigo kill him.

BG9's Schrift could be The Karma (so he could be back as BG10) or The Knowledge.
Robert's Schrift could be The Nimble.
I don't have a clue what Shaz's Schrift could be.

 

[Ultimateone]

i thought robert's would be like "N" the Nines. as he had two guns that could be 9mm.i have no idea what bg9's is and shaz domino got replaced so it doesn't matter.