It does appear from each video that the 90 degree (or maybe 135 degree) roll was started much before the plane was vertical.
However this only takes the axis of the fuselage into account. The flight path will be further reduced by the Angle of Attack, which will add an additional 10 degrees from the vertical, when pulling this sort of G.
I am sure the AAIB will be carefully measuring the angles involved, and taking into consideration any camera perspective or telephoto effects.
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Last edited by phiggsbroadband; 26th Aug 2015 at 07:27.