... nobody here can even present as a fact this person is not as many suspect PV ...
Could you present as fact that this person is indeed PV? Do you have proof? I would like to see it please. Thank you.
Last thing you want is your project branded a scam before it starts. It looks and sounds rather promising in some ways.
Again, you are free to do so.
As for the previous ICO, any investor should be able to easily prove their participation. They can sign from the bitcoin address that they sent to an ICO address. However, this dev no longer has any access to the database.
If you are at the top of a building and decide to jump, it is not my fault is it? I'm just watching you from the street.