It seems that the airmchair quarterbacks around here have never heard of the KISS principle, AKA Occams Razor.
There is, for example, a very simple possible solution. If a wiring bundle is incorrectly secured it can chafe against the structure until some insulation is damaged. This has happened many times in the past. This can cause an electrical arc without tripping the associated breaker. The arc causes a chain of insulation damage to adjacent wires in the bundle which will either short or go open circuit depending on wire thickness.
We now have multiple and confusing errors with apparantly random breakers tripping and a probable drop to alternate or direct law, all accompanied by choking insulation smoke.
At this point loss of control is very likely due to confusion and pilot overload.
There are, of course, other events which could explain the known facts and it is premature to draw conclusions until all of the evidence is in. History tells us that the "swiss cheese" model almost always applies with a simple failure completing a chain of hazards.