how much cargo was on board that airplane ?
The figures will come out in the report but at this stage that is not something you need to know. In the good old days is was called "commercial in confidence". I've seen the figures and they are correct. You can do the maths if you need to.
almost an involuntary invitation for a dual input
Like all Airbus FBW, there is an audio/visual warning of dual input. If either pilot takes control with or without saying so (take over PB), there is also an audio/visual warning for that as well. They won't stop PIO/CIO but should reduce the chances/time. Having said that, if you're running out of runway, everyone pull together!
Midland 63
All bets are open at this time and your theory is certainly one of many that the investigators will look at.
Whatever happened on the take off, well done to the crew for getting her safely back onto the ground
