So I was rewatching some KH3 cutscenes and I noticed something: a certain "heart" symbol is drawn on the blackboard of Yen Sid's tower. And this symbol is basically the same as one of the new black chess pieces that are seen in the epilogue. Take a look:

What (or rather, who) could this represent?

A lot of people are speculating it's the Master of Masters, since it's the symbol that appears on the Book of Prophecies.

Spoiler

Pretty sure it represents the Master of Masters

 

1 hour ago, Azure Flame said:

 

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A lot of people are speculating it's the Master of Masters, since it's the symbol that appears on the Book of Prophecies.

 

Oh, I forgot that was the symbol on the book. I wonder why it's in that blackboard though.

Yen Sid was probably a student of one of the new Foretellers.  He is a retired Keyblade Master, after all.

Spoiler

He also keeps close tabs on the balance of light and dark in the World, and likely sensed that this was all to bring about a certain person, but we know that he also doesn't like to assume things until he knows for sure. As he said of Xehanort in DDD and what his attentions were "I must not assume..." and then he stopped making guesses based on his information. I feel he knows of the Master of Masters but did not mention the issue solely because he did not want to assume this war would lead to his return.