Seems to line up with that one rumor, only maybe the leaker got it a bit different.

Evil = Rider that uses dark riders
Demons = Rider that uses showa powers

Edit again: It's a mole. A reference to Amazon's Mole Beastman

That makes sense. After all, a mole digs the ground like the drill does and that arm reminds me of a drill shape

Wait. The Weapon Revi's holding in Mantis Genome is a reference to the Sonic Arrow from Kamen Rider Gaim, wielded by users of the Genesis Driver or it's Core (like Kamen Rider Gaim when he is in his Jimber Forms).
Clever Toei and Bandai.

Man, Hiromi's (or rather the suit actor's) right arm really is getting a real workout, first a spider web shield hanging off the shoulder, now a mole drill gauntlet. That said, I'm glad this means that not all of Demons' vistamp abilities will just be cgi.

Not only that, looking at the bow, it seems like it can split in half, no doubt to grip in each arm for the Remix Mantis form.

I didn't phrase it well, but I was right about the mantis scythes being one thing when Revi isn't using Remix with Vice.

If KR Demons uses power of showa, doesn't his upgraded forms shows reference to Riderman like just only the hand or arm changes

So with Batta in Demons’ arsenal, and with Amazon being a mole, what animals and dinos suit the other Showa stamps? The Genomixes are impressive so far.

And we got Evil Jackal based on Genm! Love it!!!

Since Ichigo and Amazon’s animals amazingly actually make sense for them ‘lore’ wise it has got me wondering. Right off the bat I’m thinking Lobster for Riderman, Ladybug for Stronger and Whale for Black

A whale is on the tree. But is there a lobster & a ladybug too? I thought a whale can go for J?