ORIGINAL: Veltro
I've seen several C-17 demos over the years. The performace that plane has is amazing! I'm still not seeing what the pilot did wrong, other than perhaps turn too tight for that amount of bank.
Beyond the obvious things such as airspeed & attitude, there are a lot of things that the crash video can't tell us - weight, cg location, density altitude, winds, trim & throttle settings, etc., etc. Poor calculations by the flight crew on any combination of these could have spelled disaster to the common air show flight profile.