Actually, I think this two people who are saying two different things because two different things happened.
I could be wrong but here's what I see:
1) Pvt2 posts on btcfast's thread to trade btc for Preev
2) btccfast contacts Pvt2 through skype to initiate trade (scam)
3) btcfast responds to Pvt2 in bct forum PM
The contention here:
(him is being used generic here, if you are a her just replace him with her)
1) Pvt2 claims that btcfast contacted him after a PM is sent through skype to initiate trade but scams btc from him and does not send Preev.
2) btcfast claims that (skype) btccfast is not him.
The problem I see is that it is believable that Pvt2 was contacted by someone other than btcfast.
My recommendation to Pvt2 is that he removes all IM contact information as this provides scammers your contact info to initiate their scams. All contact info should be provided to the verified user through private methods, not open for all to see (unless you are operating a business then you should be public with your information).
As far as this matter is concerned, I don't see it being resolved. There is not enough proof/evidence here.