Haha, that sounds almost exactly like my INTP. The caring/not caring part is very important though. At some point in his life, an INTP can enjoy being kind of an unofficial leader amongst his peers (mine was like that in high school and for a while in his 20s). Eventually, however, they tend to get tired of people and grow not to care enough to keep doing it. So, to sum up, from my perspective it could go either way... Especially because the ENTPs I've known were definitely not good at influencing people. But, of course, I don't know your brother, and you do
