Depends on how they're defining leadership in TFA, as it is vaguely written such that it could mean managers or it could mean technical-leaders, e.g. a team lea

Depends on how they're defining leadership in TFA, as it is vaguely written such that it could mean managers or it could mean technical-leaders, e.g. a team lead / tech lead type. If I have an idea that I know is correct / am sure of, I would broach it with the concerned folks. If I couldn't get them onboard, and was still sure I was right, I would discuss it with the senior engineers to get the feedback. If, at that point, I was still sure the idea was right I would try to once again try to convince the team of the merits, with the available appeal to authority. At that point you either win, give up, or try to convince management to enforce the idea.