Now that he’s the One Eyed Raven, his powers of warging and prophetic dreams will be extremely valuable in the war against the White Walkers.
Luke Arya, Bran is looking much more spiffy and put together than he has in years.
After fleeing Winterfell with Rickon, Osha, and Hodor, Bran has had quite the long journey and transformation.
Considering that he and Meera have faced off against their share of the undead, they’ll also be able to give first hand accounts that will back up Jon’s claims.