I can see right away why you don’t feel like the bottom leg is helping. You’ll need to start with the hooked leg up much higher when trying Superman from Gemini on the floor. Right now the top leg isn’t high enough to allow the bottom leg to support you, your toros is too high up.

If you want to keep doing a Gemini from the floor, instead of going right into Superman try getting into Gemini, lower the whole torso down to the floor, then move into your set up for Superman. This will help get everything in a better place for the flip.

Everything else looks really good actually! I wouldn’t call it a fail at all, just a bit of a challenging getting there.

Good luck, feel free to send any more videos if you need help or have success!