Precisely, this is one of the notions that leads me to the conclusion that he is incompetent. As stated several times, those were merely circumstantial assertions, none of them were definitive. However, one would hope with 5 plus years that he realizes that the premise was indeed horrible. I also think it is significant to note that he didn't add them, plans are just that. I prefer to analyze the objective facts, Toon Zelda was excluded (regardless of his intent).
The circumstances are entirely different for this game. It is a new console, a new generation of gaming, and the desire to utilize Smash as a console-seller is more prominent. So including a double-clone from a series that most deem complete seems unlikely in this iteration. I don't care what he was thinking 6 years ago, none of that is relevant currently (obviously it is a good indicator, the results seem negligible though).
Incompetent in your opinion or not, all those points are based on the
chance he's reconsidered, none of them are actually grounded in anything more than a possibility we have no proof will even happen.
And yeah, Toon Zelda didn't end up making the cut, but if he was going to count up how many reps Zelda now had, or think about the fact that Toon Sheik didn't actually exist, or really any of those points, it would've happened before the actual implementation and programming started. Again, it's really just basing it on the
chance that she passed the initial green light, when all these problems were just as apparent, yet when the programming started (which isn't generally the stage characters get cut for conceptual reasons, usually just time constraints or programming issues) Sakurai suddenly realized all these problems and decided to cut her. That's not very likely, and really is just a guess, it's hardly enough to definitively say that will keep her out of future games.
Also, I don't see how including a double-clone from a series that most deemed complete back during Brawl times isn't a problem (and even if it is - it still was attempted - so it wasn't a problem to Sakurai), but now, after Toon Zelda has only continued to re-appear is now a problem. If anything it should've been a bigger problem then, not now.
Lastly, Sakurai's opinions, especially opinions we have absolutely no proof have changed are of course relevant. He's still making Smash games, isn't he? Plus he often includes characters and ideas he wasn't able to include previously.
Toon Zelda does have some points against her, but to argue reasons Sakurai has looked past only to say "He's probably changed his mind. Plus she didn't make it - that proves he didn't want her after all. No matter, what Sakurai attempts in past Smash games isn't relevant to future Smash games." isn't the best approach, considering it's all predicated on guesswork. If you prefer to analyze the objective, you shouldn't focus so much on unfounded possibilities.