So At what point was Leia meant to bring Obi-wan to Alderan? Is there a reason that Obi-wan could not have been picked up because stealing the death star plans went wrong? Was the Tantive IV meant to intercept the plans or was it a last ditch effort to get the death star plans and it interfered with Obi-wan being picked up?
In the Radio play, the plan was that while on a “mercy mission” the Tantive IV would stop around the planet the plans were stolen from (I forget if it was named) before jumping off to Tatooine to pick up Obi-Wan. It might have worked too if they had plans to deal with being scanned by Imperials before they tried to execute it.
I don’t know if that will be the case this time, but we’ll see.