I do understand that this site is to educate divers if something happens. What I do not understand is those that have tried to belittle his credentials. He was a great person and yes, very dear to me, so reading some quotes that he was not qualified or ready to be there, or even one that he bought a course, should not be part of the post. Answers is what is wanted. Lies should be removed. Those who knew him and dived with him were friends. They do not take courses lightly and quotes like that are sad when posted. If they want to post to help, that that is what they should do.
While I don't doubt he was a "great" person, that does not necessarily mean he was trained for the dive he was on. And because he dived with friends doesn't mean he was in an appropriate dive situation, or dived according to his training. While we would like to have facts, all we have to go on at the moment is speculation, yours included, since you haven't provided anything further than what's already been posted.