Hi,
PMFJI, but I don't think turbulence played a direct role at all in this accident.
That can be .. but no one had already show out a scenario for explain the sudden bank angle and turn to the right when AP disconnected...
This "going to right" (despite the apparent correction to left by PF) will continue until plane contact water ..... (BEA graphic)
If not turbulences or weather induced .. what is at play there ?