As ever, I remain convinced this accident had its beginnings with loss of a/p. We think we know better, but we do not. We assume PF knew right away the conditions, I suggest neither did. A/P loss due turbulence happens, and the 330 will remain in Normal Law. This would explain his cavalier attitude with Pitch, and focus on a newly twitchy roll axis.
We need to be careful about assuming things that have no direct evidence to support, and cognizant of possibilities that do not rest on a fundamental understanding of the recorded events. They had nil access whatsoever to records, none. They had their senses, we think, and what is left can be explained by any combination of cues and data that can be imagined.... It is common here, for some to base a condemnation of the crew on a single fact, and then assume truth by asking "Why"? I submit that is absurd... It is possible PF assumed NL until PNF announced Alternate Law. That is sixteen seconds of NU. NU that may have resulted from an erroneous, though forgivable, assumption of his, which thoroughly would explain his "negligent" back stick...