I felt much the same, the idea that Hulk got scared. And we’ve already seen Hulk develop increasing language skills and personality.
Reading your analysis, it got me thinking & wondering just what Marvel would be willing to incorporate from the comics. If Banner’s childhood mirrors the comics, we’re looking at a history of a violently abusive father. Thanos could be providing quite a father figure flashback if that’s the case... but in the end it could be key to unleashing rage unlike any we’ve seen from the Hulk!
Thank you for the comment!
I'm not sure where they are going, but they have a lot of history to use if they want.
I think they will continue to play with the character for as long as he's in the films.