How would you change the ending of the story

Honestly I would not change the ending. Holmes captures the essence of human observation, "The past and the present are within the field of my inquiry, but what a man may do in the future is a hard question to answer" (318). He speculates that Stapleton might have returned to South America to establish his claim from there, or that he might have taken a disguise in London. Finally, he considers that Stapleton might have used someone else to claim the estate. Holmes would rather leave the case as it is as human nature is the most difficult riddle of all. You might do more with the question of Stapleton to add more finality to the story but I'd leave it like it is.