Honestly if I were you I would watch Oliver Taza. He's a brown belt under Firas Zahabi and John Danaher and he's a junior member of the Danaher Death Squad. I think he's got the most well rounded game of the bunch even though he's not as accomplished as Gordon Ryan, Garry Tonon, or Eddie Cummings. But get on youtube and watch his matches and you'll see how good he mixed up attacking the lower body and upper body.
I can't embed videos on here like I used to but look up Oliver Taza Matrix Invitational and wtach those 4 matches first:
https://www.youtube.com/results?sear...x+invitational
His best sub is the inside heel hook but he never pushes for it to the point where he's running into a wall. he always mixes it with good passing, back attacks, various front headlock strangles, various triangle strangles, kimura traps, hook sweeps, and he's always attacking one level to open up another.