Hi Takata, I presume your question is about "my" conclusion and not about the facts (as you already said that the experience of the pilots was in the report...) So...
I am french (so are you as I strongly suppose...) and to a frenchman the fact they say : captain 16 rotations to SA, co-pilot1 39 rotations to SA, co-pilot2 5 rotations including 1 to Rio is the obvious (to me!) proof the others have not. Else why would they specify this fact ONLY for co-pilot2?