What if Nguyen Chi Thanh https://en.wikipedia.org/wiki/Nguy%E1%BB%85n_Ch%C3%AD_Thanh hadn't died (under disputed circumstances) in 1967? He was 53 at the time of his death, relatively young for a Politburo member--eight years younger than Pham Van Dong, seven years younger than Le Duan or Truong...