Interestingly, the "dented" area people are seeing above the C-Pillar is a different, stronger material (dark blue = high strength steel) than the surrounding majority areas (gray = mild steel). That section also is added/welded between different steels, which may result in the "dent" variation some people are seeing (?).Thanks insightfully and Andrew. So, not very much of our cars are made from aluminum.
Also FYI for those that haven't seen it, these pictures come from the "Emergency Response Guide" published for the Gen3 Insight.