As for Ganon, I don't feel he's properly represented as a mediocre Final Smash. All that is is a one-time signature move of Ganondorf. Ganon is not a giant in every single incarnation, and sometimes just a large character. This is no different from Bowser in that regard. Hell, Ganon works just fine as being around Bowser's size, and he's no giant in ALttP either. Most of the time, his size tends to change because he's similar a Moblin design... who were often giants in the same game that Ganon is a giant in.
I feel the Moblin design is something worth representing due to moveset potential, being the original main villain and a very notable and memorable form too(he's the iconic Ganon, not that beast form in TP or even Puppet Ganon). The fact he uses weapons as soon as his second fight(ALttP) makes him a great idea as a weapon user.
Also, as said, Ganondorf isn't getting a moveset overhaul. Not to any insane degree where he's unrecognizable. There's no need to. He represents the Triforce of Power really damn well, and that's the biggest focus of who he is. A murderous brawling mastermind. Balance-wise, tweaks would be nice, but other than a lack of a signature move or two(besides turning into a version of Ganon), he's pretty well enough. It's a great coincidence that him being a clone is actually a good representation of his characterization, but I do think more tweaks is the most logical solution. He does teleport, so that would be a reason Up B change. Warlock Punch works fine since it shows off his strong he is, but I do think Dead Man's Volley has a place overall in his moveset, even if only a custom, just like the Sage's Sword is. His Side B is already perfect and something he does in WW and TP anyway. Only his Down B sticks out, but who says he can't power up any part of his body for a mega powerful strike? That's even something they incorporated into Hyrule Warriors due to Smash and it fits him super well. I'm not against changing out Wizard's Foot if they can find a suitable move that also lets him approach easier.
I am also okay with Toon Ganondorf using two swords if we aren't getting Moblin Ganon(who can always use two swords, but signature weapon is legitimately a trident. Also, he seems like he'd fit using Dead Man's Volley somewhat too being we first see its usage directly within a game where Moblin Ganon is a major character, at least compared to his lesser importance in OOT).
Anyway, whether DMV is added someday should be interesting. Of course, as pointed out, it's used by a lot of bosses that isn't even a variation of Ganon or what is a created clone of him in some way(Phantom Ganon is designed to be like a magical clone of Ganondorf's powers overall, at least in his first appearance. He's now just a notable magically created minion). That said, it's really a question if Ganondorf would get it or a new variation of Ganon/Ganondorf instead. If at all.