Machinbird
I might misunderstand "pulsing" as you employ it. If he was 'pulsing' in Roll Direct, wouldn't the traces be "serrated" to show input/reverse of input as the a/c stuttered in bank angle? A 'choppy' excursion, not a smooth one? The ailerons would be deflecting, stop, then recommence deflection, creating the exaggerated banking we see?
The stick would return to center after each pulse, yes? That stops the bank in ROLL DIRECT? In the traces, I see banking that is smoothe, once commenced, albeit overdone. It may be that the graph has insufficient resolution.