I see. A shame none of those classic Ridley grabs can be used. About SSBB Ridley's tail attack, it was my least enthusiastic idea, so no major loss bout that move going unused. I had completely mistaken your Ridley's Up B for another move I had seen in your Showcase video. I had thought his Up B was going to be the one where Ridley goes straight up into the air from the ground. Now that I know what's his Up B, the SSBB Ridley attack is VERY redundant indeed.
About the new Down B, it's neat and original for a Smash game. I don't remember anyone in Smash games being able to activate a Super Armor mode outside of a Final Smash. However, you mentioned earlier that his movements will be slowed down by 30% when he triggers it. Is this slowdown strictly for his walking/running/jumping animations, or does it slowdown all of his attack animations as well? As for his ability to reflect projectiles, can Ridley alter the direction of the projectile by crouching and jumping? Being able to reflect them back at different angles would make it similar to the R-Button bubble shield, and may allow for interesting uses in 3 or 4 player matches.
As for his Final Smash, is it possible to program Ridley summoning Kraid from Melee (Brinstar Depths Kraid)? The final smash would consist of him rising up in the background from the bottom of the screen exactly like he rises in Melee, and then starts slashing the stage, damaging people on it. Or perhaps, if you wish to take advantage of Pit's Final Smash coding, instead of slashing he could start throwing his boomerang claws + belly spikes that would ''technically'' replace Pit's angels, but hopefully they can be made more useful than Pit's minions :D. If any of these two Final Smashes can be done, Ridley should be allowed to move around and attack normally (again, like Pit) so that he can take advantage of the chaos being caused by Kraid.
Honestly, it'd be quite a sight to see both pirate generals on screen helping each other take out their enemies. Though the Super Metroid Ridley-flying-towards-the-screen Final Smash idea is also a neat one I must admit.
And lastly, is it possible to animate Ridley's fireballs to shoot out of his mouth like the image below? It'd make for a nice visual effect.