Sanders was dead before Pepsi bought the company, He died in 1980 and Pepsi bought it from RJReynolds in 1986.
There is an extensive write up of his very public complaints about whomever ruined his recipe. So maybe it was Hublein or RJ Reynolds. He actually went to restaurant sites for “promotional” cameos of cooking, and physically cooked their recipe and on camera threw it in the garbage, then served his recipe to attendees. This got around quite a bit. KFC of today is terrible. Am not a cult fanatic but there are very live websites on the entire story, including the still available source of the herbs and spices in a single container you can buy. It has to be pressure cooked during frying as understand.