I didn't read the whole thing so maybe it's addressed, but from what I understand it sends packets to both private and public IPs of the person you want to talk

I didn't read the whole thing so maybe it's addressed, but from what I understand it sends packets to both private and public IPs of the person you want to talk to, and use the first one you get an answer from. What if the private IP from the other peer is in another NAT, but in your local NAT, you have another peer with that same private IP? He would answer you, and would would establish communication with the wrong peer? Probably would need an extra step to validate the peer's public IP address is also the same?