I think Vince looks at Brock as a modern day Andre the Giant. Just look at the way he is booked. Hes a special attraction. Once in a lifetime athlete/spectacle (just like how Andre was in regards to his size). Athleticism for Brocks size is something more unique since weve already seen so many big wrestlers (Big Show, Great Khali, Braun Strowman, etc) Hes booked as nearly unbeatable with only the very top guys like Roman Reigns can beat him (similar to Hulk Hogan going over Andre). The obvious difference is that Lesnar is all about the money and doesnt care for the wrestling business like Andre. Brock is known all throughout the world and doesnt like people and hardly interacts with the fans, similar to Andre. Brock also provides a sort of "realness" to his wrestling style as being unbeatable due to his credentials, similar to how Andre was booked to be unbeatable (even lifting Andre up for a powerslam was considered a big deal). Right now Lesnar is the biggest heel in the company who has the most heat because modern day wrestling fans cheer the darling indy heels (Owens, Nakamura, Samoa Joe, Zayn, Macintyre, etc)