The rituals in the technique don't need him to understand or comprehend them. The rituals are more like steps he has to go through to become familiar with weapons. What he understands are weapons, not the rituals themselves.
This has made the technique very difficult to comprehend. But it has also made him proud of the progress he has made. Even though he made significant progress in the amount of karma he earned these two years, he is not as proud of that as he is of his progress in the unification of heart, mind, and body technique.
He looked at the amount of karma he has earned and said, "250 million karma over 1 billion karma. So I've made a progress of 25% in 4 years."
The amount of karma he earned increased from 47 million to 51 million a year ago and then increased again to 54 million this year. It was because the number of students in his dojo had increased in size.