There's a short-circuit in that logic though. Putting aside that there is 0 evidence that Han Jian is abandoning his family's Way for the Argent Way, Han Fang is not better equipped to exemplify the main Han line's Ways. He lacks the blood, and he hasn't been cultivating the core familial arts, owing to his adoption into the clan and role as a servant.
It's not feasible for him to take Han Jian out and get elevated to the guy's place. He'd just get spanked. Even if Han Jian's dad was secretly ordering Han Fang to mess him up, it's not like Han-dad would be offering elevation to main line privileges. "They won't be main line like Heijin" "He was only adopted, that wasn't a light thing to request." Blood matters to these people.
On the other hand, it would be amazing for Han Fang to pull a Dio. First step: kick Heijin.
It's not feasible for him to take Han Jian out and get elevated to the guy's place. He'd just get spanked. Even if Han Jian's dad was secretly ordering Han Fang to mess him up, it's not like Han-dad would be offering elevation to main line privileges. "They won't be main line like Heijin" "He was only adopted, that wasn't a light thing to request." Blood matters to these people.
On the other hand, it would be amazing for Han Fang to pull a Dio. First step: kick Heijin.