I mean, I’d say he was pretty helpful. I’d be willing to bet he was the only person in the galaxy that knew all that information about Ochi, where his ship was located, etc.

To respond to your edit, I actually don’t understand how this would help tension either. How many seconds are inbetween the line and him removing his helmet? And didn’t the guy just kill a stormtrooper? Pretty sure we can trust him. Yes, having him mention Leia makes this abundantly clear to the audience, but it’s just for a few seconds.