EMIT,
As I've said before, my feeling (and that's not worth anything, really) is that it is more likely (but not overwhelmingly) that the TL was left in the climb detent than there was a mechanical disconnection between the TLs and the TCU.
It is humbling to witness the infallibility which pilots seem to attribute to those who design and those who maintain the systems of mechanical, electrical and electronic linkages which you never see, but rely on for the lives of yourselves and your trusting passengers.
The formal enquiry needs to rule out a linkage failure (based on evidence) if it is to safely conclude that the TL was left at CLB. Even if it doesn't, Airbus would be as well to re-visit the ATA76 FMEA.
I've had enough of re-iterating the same old points and I concede that I'll never get through to those who have already made their minds up, so I'll shut up now.