My version opens with some repurposed YT film that represents the Bothans stealing the plans but being tracked.
Off to Luke on Dagonah, chats with Yoda who dies.
NO OBI WAN. The hut goes dark, Luke leaves.
Later on Endor Luke does not tell Leia that they are siblings because he doesn’t know this.
VADER is the one that reveals that Luke has a sister, the force reveals it to him during the duel.
Leia cements it that they are brother and sister, the Force has opened up to her, too.
We already know this if we’re watching things 1-2-3-Rogue 1–4-5-6