This is all very sad and so unnecessary.

As far as I can ascertain, no actual cause of the crash has been determined and is not likely to be. Could have been the battery, might not have been, could have been the rx, might not have been, either way there is no proof that a twin system would have saved the model, its possible but no one knows, we can only surmise.
Just recently a friend of mine lost a large-scale aerobatic model (with twin systems) and a small jet (single system) within 48 hrs. the fault? A loose wire in the tx! Single point failures are everywhere….they will find you one day!

I know both David and Ali and have done for many years; I have always found them great guys, constructive and of course opinionated (as are we all).
Yes, David can be a little abrupt, but I do not feel his statements were meant to be taken as insults.
I feel he is just very passionate about the hobby and safety (as I know is Ali) it is just his delivery that is at fault.

The crazy thing is that both you guys want the same thing, safe flying and successful models, you just express things very differently.

I consider you both to be good friends of mine; I would hate to see you ending up as long-term opponents over an argument that no one can win.


Regards
Paul