Rafael Herrera had two pretty great B2B wins against: a) Chucho Castillo and Ruben Olivares in 1971/1972 and b) Ruben Olivares and Rodolfo Martinez in 1972/1973.
Yeah you are quite right! He does have Angott then Armstrong the first time which keeps him in the chat but definitely not the sealed tomb I though it was.
Harry Greb beating Micky Walker and Maxie Rosenbloom back to back in the same month back in 1925 was pretty impressive.