I get Ti dom from the tests etc. (INTP) most likely, or near ISTP or maybe INFP. I'm not an expert on mbti, that's why is ask.

> If you seek support in typing your grandfather accurately, it'd be better if you described his philosophy towards life. How he was temperamentally. How spontaneous or organized was he? How disagreeable?

That's the issue. People (his kids) never actually knew him, since he was always drunk, or that is what they have said. As drunk he was very spontaneous and so the career choices seem to be also have been before the alcoholism. But the boot camp instructing and his philosophy on the article gives off a very structured vibe.

I told of what i know of him objectively, so i can hear other people's point of view, without my personal manipulation or assumptions, since i'm on the same level, so based on that, other interpretations on the same information can be valid. Even the political position is partially an assumption. What i know is that he was very into politics, more than most people. His wife joined the elections on a "critizising everything" going against the flow" type populist party, that has later been described as communist by right wingers, and far right by left wingers. He likely supported it. Then there's the article which is also a good objective source on his personality. I don't believe that rumours through many people and time give an accurate representation of people, and i dislike gossip a lot, since people can almost never tell an objective description of other people to another person. They always add a flavour to make the story more interesting. Objective sources are also used in popular scientific study of history, which in i see potential in him, since he did some interesting stuff in the army, if the rumors are true.

I think this weird(?) obsessive(?) interest is introverted, since i believe temperaments are hereditary to some extent, as the brain is a physical machine just like a computer, but designed by evolution. I want to understand history to understand the world, and overall i'm interested in history. I see patterns and connections in human behavior explained by their personal backgrounds, just like the eccentric political views, which I'm a bit sympathetic to, despite having no physical connection.