We can only answer these questions based on the information that is available online, but we don't know what's true and what isn't. So, if we assume it's true, then here are my answers.
1. Murray was not an employee. For tax purposes, he would more likely be considered an independent contractor.
2. Not an employee of MJ or AEG, as reasoned above.
3. Yes, self-employed.
4. No matter what he was, it was not his responsibility to insure MJ.
5. I don't understand your last question, so can't answer it.