Don't know if you will need a 100A ESC, but a Power 52 with a 12x8E prop on 6s sounds good to me. I would start with a 75A ESC hooked up to a wattmeter and see how many watts you're getting with that 6s battery. I would experiment with other prop sizes as well. Usually, the larger the batteries (more cells) the less amps. Very good chance you won't need a 100A ESC. Seems a bit much. Good luck to you friend.