I think Leo is going to be the next signer because he has the power tool dragon and resembles the 5th dragon in the show. It will probably be episode 51 that the true 5th signer will be reviled and there is a very strong chance that the 5th signer is ether going to be Leo or Goodwin. And Goodwin is probably just going to help because his brother is a dark signer so he wants to defeat the dark signers to try to save his brother.
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