>>36286064K. Rool is not a tricky guess. Simon would probably be a little more on the risky side but think of it this way: if he knew Ritcher was being worked on alongside Simon then why wouldn't he mention him too? Nobody knew for sure that we were even getting any Castlevania representation at all so it would be ridiculous to claim that anybody from the series other than its main character would get in, and this is exactly why his credibility would've skyrocketed if he'd predicted Ritcher BEFORE he was announced.
Getting a few guesses here and there (Simon, Chrom, K.Rool) when you have nothing to lose is certainly a way of getting your foot in the door, and now that he's done so he's moved on to making much bolder claims like Terra, and Sable (and safer claims like Shadow and Isabelle as they would've been announced by now if they were AT's). If he really had genuine sources then he would've made that clear to us with the other night's reveal, but right now all he's doing is pushing the ball of yarn to see how far it takes him.
tl;dr stop falling for confirmation bias