That's something I noticed when taking screens for the GIFs, too. Ridley is definitely grabbing/holding Pikachu, but Pikachu's tail isn't dangling down; it's off to the side somewhere. I think it's one of the shadows that forms the V-shape, intersecting with Ridley's tail shadow.Ok I can confirm too that its not Ridley carring Pikachu....Its at 1:03 mark in this video. You kinda gotta spam the pause/play button and get lucky. You can see Ridley's tail shadow leading up to the tip where the terrian makes Ridley's already zigzag like tail look more like Pikachu's.
https://www.youtube.com/watch?v=fb35vh33Mb8
Knowing that we really can't say how big Ridley is now. If someone can get a screen cap it that would be great.
Yellow blotch is what I see as Pikachu, purple line is what I see as Ridley's tail. The shadow to the right of the tail could be either Ridley's arm or leg shadow.
I think Ridley's foot is somewhere in the mix, too, but it's too difficult to tell.