ok so Leia was heading to Obi-wan before the Battle of Scarif, and before she ever knew she or anyone would have the plans. It wasn’t just a last resort, “vader’s bout to get us we gotta go somewhere” decision. the fact that she was going to Obi-wan is probably the reason she was with the rebels and not on Alderaan.
so think in the context that a) Bail was knowingly sending his daughter, who has the genes of one of the most powerful force users ever, to go get a Jedi, b) Bail knew that he was sending the biological child of Anakin to Anakin’s former master and friend, c) Obi-wan definitely would knows who Leia is, d) Bail knows that Obi-wan is keeping an eye on Luke.
I’m not saying Bail Organa knowingly sent his force sensitive daughter to the only fully trained Jedi he knew how to get in touch with and also her force sensitive brother, but Bail Organa knowingly sent his force sensitive daughter to the only fully trained Jedi he knew how to get in touch with and also her force sensitive brother. Because he and Mon Mothma decided things had gotten to this point.
Bail Organa is a normal-as-heck senator that looked at the flaming ruins of the space wizard hangout and went “I should go check this out to make sure everything’s ok.”
He’s a guy who saw one of the young students there get gunned down and went “I should go find what survivors I can.”
He’s the guy who dropped off Yoda to go try to assassinate the Emperor and picked him up when it failed and everyone was looking for Yoda.
He’s the guy who gave sanctuary to the only two Jedi he could find and the two Jedi that would be the highest of the Emperor and Vader’s list.
He’s the guy who watched one of his closest friends die after giving birth the children of the second most dangerous/evil guy in the galaxy, and began making arrangements for the children’s safety.
He’s the guy that took the daughter of the mass-murdering sorcerer who ruined the galaxy and decided to put himself and everything he held dear at risk to raise her as his daughter, give her a loving home.
He’s the guy that taught his daughter, who has the genes of the most powerful Jedi that’s ever lived, to channel her passions into righteous causes and the aid of others.
He’s the guy that started the Rebellion before there was even an Empire and who constantly put himself, his family, and his people at risk so that people across the galaxy could continue to fight against tyranny.
Until recently, Leia had thought her father didn’t even age the way other humans did. However, in the past few months, time and stress had begun to weave gray into the hair at his temples, to etch new lines on his forehead and around his eyes. – Leia, Princess of Alderaan
there is a 100% chance that Bail did not call Breha ahead of time and just showed up on Alderaan, got off the ship with his cape fashionably covering one arm, and was like “Hey babe, remember when we talked about getting a kid” and he just dramatically pushed back his cape to reveal baby Leia