Place clause: From London, John thinks the plan unwise.

[Navi]

Which of these sentences are correct if John is not, at the time of speaking, in London, but was born in London:

1-From London, John thinks the plan unwise.
2-John, from London, thinks the plan unwise.
3-John from London thinks the plan unwise.

It seems to me that in 1, being from London has a causal relation to John's thinking the plan unwise.

In 2, "from London" seems to have replaced the non-restrictive clause 'who is from London'. Thus 2 would have the intended meaning.

In 3, 'John from London' seems to form a single unit, but I don't know why one would want to form such a unit.

[Touhou]

Navi,
You have shown a lot of strong deductive thinking. Good work. To add to your conclusions:

1. The ordering of this sentence is ambiguous. Because of it, one cannot discern whether John or the plan is from London.
2. This is correct. It starts us off with John and follows up with a small detail about him.
3. Incorrect. One function of commas is to organize small details like birthdate or birthplace into their own space.