MPDOK uncovered an issue with k=3 risk estimates apparently used in Nvidia's excellent cuFolio Markowitz portfolio optimiser and Basel's failure to get beyond 1-hop. Claude and Gemini seem to agree there is a problem. I hope I am wrong and would be grateful for review by those involved in portfolio risk assessment. If MPDOK is correct, are looking at another avoidable 2008 financial crisis? https://felixquinihildebet.wordpress.com/2026/05/19/the-next-2008-financial-crisis/