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Because Ruth has claimed Boaz as her Kinsman Redeemer, Boaz is in a position to do what ever is in his legal right to do. His first course of action is to contact the one man who has first right to Naomi's property, and the right to marry Ruth. Mind you, like Boaz, Christ too needs us to claim HIM as our Redeemer before HE can step in to purchase us. A price must be paid to GOD, for us, and our price is death for sins committed. Jesus would pay the price and Redeemed us, without HIS fulfilling the requirement we would have no way to be redeemed. So too, Jesus purchased the World through HIS punishment, and sacrifice. Yet it was not the dirt and property Jesus wanted, but rather a bride. He gave all so that we could be HIS bride. Boaz is not wanting the land, he already owns much, but he wants a bride. So he is willing to do what he must, which in turn will redeem Namoi, and ultimately give her an heir that may sit at the gate as a member of the righteous.