Trying to understand the % I'm not trying to make Thunder upset,  I just don't get this.
Hypothetically you start with $100 and I think he said he adjusts his bankroll weekly. 
Starting bankroll $100
Day 1 win 25% = $25
Day 2 start $125 win 25%=$31
Day 3 start $156 lose 20% =$-32
Day 4 start...