Cerrone didnt have a knockout up until the Charles Oliveira fight.
JZ Calvancante used to be one of the scariest dudes in LW. He had a streak of 7 fights, where he finished 5 of those opponents in the first minute. You might say,"okay,lots of other guys did that by fighting cans". But JZs 5 opponents were Rani Yahya, Nam Phan, Omigawa, Takaya and Ribeiro, who all became UFC/Strikeforce fighters later.
Speaking of Rani Yahya, he has a wide arsenal of submissions. He has finishes by: armbar, rear naked choke, guillotine, triangle, arm triangle, brabo choke, ezekiel choke, north-south choke, peruvian necktie, and americana.