So much of Ben’s conversations with Luke are on the same level, even telling him where to go to achieve his goals, his ghost is also very concerned about the state of the Galaxy, who’s alive and who isn’t. Also, Vader has traveled to Exegol— happening in the current comics.

Obi-Wan was willing to sacrifice Leia, because he valued Luke more. It wasn’t until Yoda said there was “another” that he put stock in Leia being worth saving— even in that scene he was willing to let Leia die.

The Vader not sensing Leia might have to do with familiarity, as he recognised Ben specifically but didn’t sense Luke and only found out he was his son later, and only sensed Luke was strong with the Force when he used the Force on his Death Star trench run.