When it comes to finding synonyms for the expression "future possessor," there are several different options to consider. For example, you might use the term "prospective owner" to suggest that someone is in the process of acquiring something of value. Alternatively, you could refer to this person as a "potential holder" if you want to emphasize their ability to take possession of something at a later date. Other potential synonyms for "future possessor" might include "coming proprietor," "future recipient," or even just "eventual owner." Ultimately, the right choice will depend on the context in which the expression is being used and the specific connotations you want to convey.