"If, but I emphasise only if, you think that there is force in Mr Jeremy's submission and you were to conclude that Idiabeta was impliedly incriminating Okusanya and giving him the leading role, you would in those circumstances need to exercise causation in relation to your evaluation and assessment of his evidence in this regard because on Mr Jeremy's analysis, if it be right, it is clearly the case that Idiabeta would have had interests of his own to serve, namely minimising his own involvement in these events."