LMAO You can't be serious. Yes Ganon is Ganondorf but not only do they not resemble each other at all, they also have completely different fighting styles. it wouldn't be a screw-up to add them and to even think that when smash has done this multiple times now is laughable.
I agree with our point, but you could word it in a less aggressive manner.
Ganon =/= Ganondorf. They're extremely different characters. The current Ganondorf does slightly resemble how Pig Ganon is a physical warrior with magic... but that's how Ganondorf has always been.
The other variations on Ganon(Puppet Ganon, both ways they refer to Beast Ganon) don't work all that well as proper characters. We have a decent NPC in OOT Ganon, but that doesn't represent how he's also good with magic and weapons, ala ALTTP.
The other one that is very different is Toon Ganondorf/WW Ganondorf(either term works), who is the only canon double sword wielder, but also very fast and doesn't focus at all on magic. The current Ganondorf is definitely a magic user, but focuses on the physical forms of how one can use magic, less so the projectile variant. So that's at least 3 different styles to go with, all unique.
If it helps, I do like the idea of using Ganondorf's previous TP moveset(which focuses on his slow speed, whereas OOT is middle speed) and giving it, with slight differences, to Black Shadow. While keeping the current Ganondorf as well. Black Shadow could reuse Gerudo Dragon in place of Flame Choke or have a darkness effect if needed. I've had a few ideas to improve Ganondorf; Use the Lightning Ball as a chargeable Neutral A. You could still have the stunning effect, and it could be throw about if needed. Since it's not hyper easy to reflect like DMV(and let's be real, if it's not reflectable by weapons, it's not DMV. There's a difference between liberties and a completely unrelated thing), it makes it a useful approach option, since it can stun for a bit. His Wizard's Foot can be redone a bit, where he stabs with his in-game Knife on his ankle instead of the magic. For his Neutral Air, reusing that knife in a similar animation, but with less range, and maybe having the second hit with his sword(so he can dual wield his two weapons perhaps?) in a horizontal move so it resembles the knife's cutting motion could work. You could also find other areas to throw it in, like a second AA jab. Wizard's Foot can also keep the earthquake animation when it lands on the ground from the aerial version, which more or less what makes it stand out quite a bit from Falcon Kick, having different animations, but also power/range and specific elemental effects.