Does the Hadith of the Prophet, peace and blessings be upon him, "I and the sponsor of the orphan will be in Paradise," apply to someone who marries an orphan for the sake of reward, and is a man rewarded for polygyny?

Marrying a woman with the aforementioned description, with good intentions such as protecting her and being kind to her, brings great reward. However, it is not equivalent to the reward of sponsoring an orphan, for two reasons: First, sponsoring an orphan does not bring a benefit back to the sponsor, and their expenditure is not obligatory, unlike the expenditure on a wife, which is obligatory in return for enjoyment. Second, an adult woman is not considered an orphan, based on the Prophet's (peace be upon him) saying: "There is no orphanhood after puberty." There is no harm in marriage, provided one is capable of being just between wives and has good intentions.