I hope something comes out of the investigation that will prevent this happening again. I knew Terry well, if he could get caught out, anybody can. My bones feel a 'flat-spin' that failed to recover. Terry would have known the correct recovery technique so why didn't it come out? One would think side-by-side seating should eliminate the aft C of G trap.
The Safety Guru's have given us High Vis Vests and prohibit us from flying with a tube of toothpaste but have removed spin training from the syllabus along with certification of spin recovery. Mad, totally nuts in my opinion.
I know in the Grumman AA1 the spar is used as a tank and under certain conditions the fuel in a spin goes outwards towards the tips and can cause the spin to stabilise. Does the Brumby have a conventional fuel tank? I have spun many aircraft and they are all different in some ways and the differences shouldn't be unknown.