Maybe the knight chess piece + the sword represents the fight in chapter 3 because the knight is using the sword?
Another funny thing: If you bring Jevil's or Spamton NEO's shadow crystal to the start of chapter 3 and then use it you still get the text that the tv was [forgot the word] into pieces...
I think that the sword represents the titan because the titan is made by a sword thing.
Just a cool secret
There is an attack in the Jackenstein fight (i believe after the YOUR LONG attack) wich has 6 symbols hidden in the darkness. the symbols are:
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A crown 2. A flower 3. A katana/sword
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A knight (chess piece) 5. A queen (chess piece) (i think it is a queen) 6. A king (chess piece) (i think it is a king)
This is mostly for the theorists here!