[user104658]

Originally Posted by Smithy

The annoying thing about the final battle with Cersei is that Bran could see exactly what she’s doing and tell them but I bet he won’t

I don't think he's "supposed to" basically... he can take an active role in the supernatural stuff but when it comes to human politics he's supposed to be impartial and stay out of it.

THAT SAID...

...There's the whole thing with him being a partially "incomplete" Three Eyed Raven that makes me think there is still some Bran in there. For example, he clearly wasn't impartial when it came to Littlefinger's "trial", and disclosed things he had seen Littlefinger say in the past.

So he might drop hints even though he's not supposed to. Though I suspect he'd only give hints that would help the Starks, not Daenerys herself.