Eddie Cummings (black rash guard) is infamous for his leg lock game. His competitive record is small because he focuses on submission only or no gi formats (EBI, Polaris, Fight 2 Win, ADCC), but 81% of his victories were by heel hook.
A requirement for a good leg lock game is a high functioning, open guard. Eddie demonstrates this in this match and has one of those unheard of transitions that leads to the eventual finish.
Fellipe Andrew (right) is a finisher. He was brand new to the black belt ranks in 2018 and I became a fan after watching his performance at the Worlds in June. He has yet to win anything major, but I predict that he will.
Just last year, he amassed 42 wins in a variety of promotions, 30 by submission (that is a 71% finish rate). He either finishes by triangle or by ankle lock. Below is just one example of how smooth and fast his submissions are.