In the book of Ruth, Boaz's act of redeeming Ruth's deceased husband's property and marrying Ruth is often seen as an example of 'hesed' (loving-kindness). However, considering the legal and social complexities of the time, particularly concerning levirate marriage and the role of the 'goel' (kinsman-redeemer), what might have been Boaz's primary motivation beyond simple compassion or attraction to Ruth?