To conclude, here's the most dangerous one in my opinion (positive feedback from 2014, months after John has gone MIA):
Held BTC for the forum.
Please, people, quit posting "positive trust", this is a scammer's godly tool.
Time to remove all those ratings, too.
He held 1000 BTC for a long time and then returned it at around the time of that rating (after annoyingly being MIA, but still). This is worthy of positive feedback in my book, and it's strong evidence that John will probably not intentionally scam anyone.
I agree that it's unprofessional for him to leave everyone hanging, but sometimes life happens and these things become unavoidable. (I don't know his exact circumstances.)