What is the point of telling us that Shechem was the most honorable member of his father's household?
Rashbam: That is why the entire town accepted the proposal.
Seforno: In spite of the fact that he was, he carried out the proposal without delay - because he desired Yakov's daughter. 1
The fact that once again, the Torah uses the term "the daughter of Yakov", supports the Seforno's explanation, that this was the main cause of Shechem's attraction to Dinah.