I'd say it's pretty hard to confuse the two characters. It's like saying Link is ripping off Marth because they share a sword-based Dair spike.
I think you mean Toon Link [Link dair doesn't spike, unless you refer to Smash 4].
It may be better, technically, but I just prefer the single, powerful kick, rather than ripping off Falcon even more.
For what it's worth, I think Falcon should get 64 usmash and Ganondorf should get Melee usmash, so that Ganondorf does a ridiculous amount of damage with the move and Falcon has a cool OoS that starts combos, but something tells me this would be FAR more broken than would be intended, while giving Ganondorf the two-kick usmash isn't as much of a buff as I'd like it to be in my head [maybe a shield cancel between kicks or something would help to break it properly].
And Minus made DACUS a universal sort of thing, so even Ganondorf can do it! Hard to space, but that thing is crazy.
I actually massively struggle to do a DACUS with anyone in Minus [did you typo PM??? I dont' think Minus made everyone have a DACUS...], because doing dsmash out of a run means I must either stand still to DACUS or tilt the c-stick sideways, and I have made myself accustomed to neither of those things [I can do alright doing a DACUS standing still in PM it seems, but I often get a running start for those]. So I struggle to even do a basic DACUS with Falco in Minus.
That said, nearly all my Minus play is online, and I can't really do a DACUS in PM online, so there might just be lag johns or something.