I’m not sure what it is about this man that you believe makes him a “possible”.
My thoughts, z was a psychopath, this man is definitely not psychopathic,

Be mindful and remember that this is a mans life you’re teetering with.
There are plenty of others on the internet who would love to join you on your endeavor to find out the truth about this man. I feel you have a responsibility to their actions also.

My unsolicited advice, post nothing until you have something.

I’m not saying don’t research. Only be responsible.