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Fair enough although I would sum up by suggesting that Big Oil and its political proxies are highly unlikely to leave any definitive evidence of their inherently unlawful market rigging conspiracies, although over time historians and researchers often do eventually uncover the definitive evidence you are seeking as decades later government documents are eventually declassified...long after anyone responsible could be held to account.
Plausible deniability is their default modus operandi.
All we can do in regard to seeking to understand present day events unfolding is join the dots and consider past behaviour, follow the money, and extrapolate what is likely to be happening.