Warren Buffett's disciple Tracy Britt Cool has taken an independent route. After working at Berkshire for 10 years, she founded the Kanbrick investment fund in 2019, but her approach is completely different from that of her mentor.

First, the target scale is different: Buffett loves to buy large companies (like Geico and Duracell), while Tracy focuses on medium-sized family businesses with an EBIT of 10 million to 50 million dollars. She calls this the "sweet spot"—there is both growth potential and the ability to engage deeply.

Secondly, there is a significant contrast in management styles: Buffett believes in "finding a good management team and letting them be," while Kanbrick is hands-on. She proposes a "human-centered" framework to directly help these companies solve pain points and drive growth.

Interestingly, Tracy emphasized in an interview: "I'm not building a second Berkshire, I'm creating something different using its principles." It seems that the best inheritance is innovation.