Easiest way to raise the level of discussion in a team is to model the behavior you would like others to adopt. In the situation you describe you could do the f

Easiest way to raise the level of discussion in a team is to model the behavior you would like others to adopt. In the situation you describe you could do the following: when you express your opinion briefly summarize the basis for it and when you see others doing good work or providing useful insights praise them both privately and in front of the team.