Sorry, but I'm not buying it. Plessie is cool, but as Yoshi's mom? I can't see any real proof in the games. Seems like a big jump from a simple resemblance. Also, the Splounder thing... they're just obstacles, right?
Honestly, I didn't vibe with Super Mario Land on the Game Boy. The controls were janky and didn't feel like it lived up to the Mario name IMO.
Dude, you do realize Mario was around way before Sonic, right? Sonic debuted in '91 but Mario's been hitting bricks since the 80s. I mean, come on, the whole platforming genre was basically defined by Mario. And slow? Ever play Mario on star power? My dude's got SPEED.