At risk of being repetitive...
Am unsure how the debate about the authority gradient applies when both crew are Captains and the more senior one is an instructor PNF in the RHS. Is there anything culturally that would prevent him from speaking out?
Just how does the much discussed cultural difficulty apply here, because all the previous posts on this subject that is every single one of them, assume a FO in the RHS and a Capt in the left. Which just isn't the case here.
So what does the Capt under training/ line training instructor dynamic mean here?