I expect this thread will develop once we get some well-informed armchair experts on the thread.
But that's to be expected from any internet rumour site! However on PPRuNe you will invariable find posts from many people with suitable experience that does mean their words can and do carry some creadance. The whole point of PPRuNe is that individuals can post a question, query, opinion, view etc before waiting for completed and published reports. If you don't want to read or hear these views then stay away. If you want to suggest that someone may have misunderstood an aspect then why not try to clarify!
It's tragic that a life was lost at Valley, but I don't believe that his thread has to become condolences only. Lots of discussion on command eject - not unreasonable with one of the 2 crew managing to survive, whether or not it turns out to be a factor. Also not unreasonable to discuss turn-backs; we know the Hawk took off from and turned-back to RAF Valley. Whether it was a practice that went awry or a real turnback/forced landing that ended in tragedy, you can't expect some speculation and hence 'discussion' not to take place.