I really wonder if the last two episodes had more baylen originally, but due to the death of the actor they removed some scenes to give them time to figure out what to do (recast, deep fake, possession altering his face, death as a sacrifice). It seems like all the other episodes were building baylen and shin to be so much more than just a cliff note at the end. That quick scene seemed more apt for a film trailer than a story line.
Watching it I just had a feeling that there was a reedit before release, something star wars and marvel have been known to do.
Since they had to show something they have a quick glimpse with fan service to the people that watched rebels and clone wars.
I also wonder for the people that didnt watch the clone wars or rebels, how much of this series didnt make sense.