OldOneAncarotaur said:

When Luke leaves to save his friends, Ben tells Yoda, “That boy was our last hope.” To which Yoda replies, “No, there is another.” You eventually find out in Episode VI that Leia is the other hope to which Yoda refers. Soooo, Ben forgot that Padme gave birth to twins? He seems to remember that when telling Luke about it in Return of the Jedi, so why doesn’t he know this in Empire Strikes Back? A conundrum…….

The 'other' is implied in ESB to be another potential Jedi hope, but in retrospect if you think of the way that the trilogy played out, Leia could be just the person being the other offspring of Vader to make him see the errors of his ways.....no force needed.

There's really no-one else in the universe fitted for that role.