Stock market prices crash after VG Siddhartha’s death

Many indian companies are closely controlled with promoters who have a substantial stake. The promoters are also taking most of the decisions. So any problem of the promoter will adversely affect the company.
For example when the Cafe Coffee Day (CCD) VG Siddhartha died in mysterious circumstances, the prices of the shares of the companies he controlled like Cafe Coffee Day and Sical Logistics also crashed
Yet, most large companies have excellent systems in place, so they do not depend on the promoter