alexwolf
lurks in the shadows
This idea has two very big flaws:Quick thought: what if Law's hatred of Quixote is because he can't remember why he would trust him? If he was apart of his crew, and to protect someone (or thing) he had them turned into a toy, then he'd dislike Quixote. Seeing him for what he is.
If Quixote protected something precious from Law by making them a toy then they'd both forget about it, meaning that if everyone who was a toy became real then they remember the bonds which they share. It doesn't excuse the sea stone but it could be as simple as Law remembering a key somewhere to make sure Quixote doesn't die.
This means that there would be enough villains for the warriors to face. Kyros will battle Flamingo while Luffy battles the (newly remembered) Law. Might be some bullshit talking (aka Naruto) to switch Law back but it's a thought nonetheless.
1. As you already mentioned, Seastone cuffs.
2. As we saw, the head was severed by Kyros, which means that if Law did this, that DD would have died without Law's help, which is obviously not plausible.