Squawky,
Nothing wrong with HA's advice. If ten years experience doesn't give you some insights and the experience to offer advice, not sure what does. I was instructing with 10 years experince, and felt I was able to offer advice like that of HA.
It appears that you either knew these pilots, or knew of them. I offer my condolences, however, that doesn't mean that the advice HA gives, shouldn't be offered. 4 people are dead and MANY more will suffer pain as a result of their death, family and loved ones will live with their loss forever. Any advice to help reduce the chance of someone else dying should be offered, take it or leave it.
I understand that you might think HA is stating that his/her words of advice are each causal factors in this crash. The investigation will bare that out. However, each and every crash shoild give us pause to think about possible factors, and provide an opportunity to use those as a learning point.
Safe flying.