I'm talking about if the title is in your name. You are the registered owner. (Think of it like the Title is registered with the state in your name and you go to sell it, you aren't asked to prove how you paid for the car)
You proved my point... If someone else tries to fraudulently take your property, having the title registered in your name protects you as it is legally your property.
Calasse was the owner of the shares, with physical stock certificates and the shares registered with the transfer agent. That is sufficient for the legal system to protect his property rights. In your example, he is the "legal owner" that the legal system protects, he isn't signing anyone else's name.
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