Oscillations doesn't specifically mean an heavy wing after switching to direct roll. Read the part of the FCOM I posted above and you'll see that it is mentioned that you may have to re-trim the rudder in order to stabilize your roll axis.
Takata, Can I have the pillow you sleep on?
From the brief description BEA provided, the guy flying was bombarded by more stimulus in his few minutes holding the stick than most drivers get in an entire flight.
Do you really expect him to recall the words from FCOM in that short a time period unless he actually practiced such an eventuality as he experienced that night?
Everyone has been real quiet about their experience in Alt 2 law except the test pilots.
Do you think any really constructive training was accomplished in Alt 2 law prior to this accident? (And by really constructive, I mean the kind that makes you both think and sweat.)