Photoview question - starts on scene or not

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Hey there,
What happens if I start my scene with a gameObject with a PhotonView already added? Is the View ID keeps the same for every player? That means, I can send and receive RPC normally and it will not double the messages per player connected?
What's the big difference between instantiating and starting already in the scene (I'm struggling about thinking who is the owner, or what will come from the "isMine" variable).
Thanks in advance.