That's just it while Link and Toon Link DO share the same movesets, all of Toon Link's tools are based on his respective game, while Link has the designs found in the TP timeline. As said before in the thread, Sakurai has pretty much made it clear that the WW timeline and TP timeline are kept separate. Zelda does indeed draw from other games, but all of said stuff comes from along that timeline. If we were to get a Toon Zelda, all of her stuff would come from the WW-side of things all the way from WW to ST. That said....
As far as the Phantom goes, it's really dependnt on what style it/she is reflecting. Which is what I assume sparked the whole style debate I saw a few pages back. Something I didn't see mentioned, that foot you pointed out as more human rather than bootlike, you DID notice that the shield cuts off our view of it, right? Makes it look like a normal foot in doing so. It could still very well have the stubby feet from before as we can't see tell what the right foot looks like because we're looking at it from the top.
Anyhow, let's see... what else was said? Oh yes. Anjean summoning a Phantom, a very good point, showing that it CAN be learned somehow. See my starting point, this would be something for the Toon Zelda to borrow and use, NOT the adult one, and it WOULD explain why we see a Phantom with the 'possessed' color scheme but no glowing eyes.
All this and assuming we're not all being made fools of and that Phantom is being an Assist Trophy.
(Sorry to butt in on this by the way. That said, it's rather puzzling WHY we see a photo of this in Zelda's picture set with no explanation for it.)