In Little Busters!: Refrain, we saw exactly how Kyousuke was able to get Masato to fight with only one hand and eventually defeat and befriend him. However, when it comes to how Kengo was recruited into the Little Busters, it wasn't played out in as much detail as Masato's. Specifically, I'm referring to this scene:
There's no doubt that Kyousuke had used some dirty tricks on Kengo's father, but I need more explanation on what was Kyousuke holding and what tricks he pulled to overcome my disbelief that a kid could defeat a kendo master in a kendo match, fair or not. Was it ever explained in more details in the visual novel?