Actually, handwriting expert Arthur Anthony concluded that it was Roy Moore’s signature. And that fact that the entry was relatively long (it was not just his signature) would help make the analysis even more sure.
Actually what he saidd is that the handwriting of both parts(blue and black) are the same. He has no sample of Moore’s to compare. Looking at it I think he is wrong. The shapes of the letters is not consistent between the colors. That might fly in a text but not in a signature.