The mind and soul are definitely related here.
That is an assumption that I don't believe can be verified in scripture.
Some people say the soul is mind, will and emotions.
Again, an assumption. In both the OT and the NT when speaking of man, soul and spirit are often used interchangeably even though the soul and the spirit are not precisely the same.
The "natural man" is definitely pitted against the "spiritual man," and natural in the Greek is literally the soulish man.
Another assumption it seems to me. Soulish technically described any blooded animal including man. But only man has a spirit.
Which is also called the mind of the flesh.
I don't know where you are getting that. Flesh denotes the physcial, the mind denotes the mental.
It can be a challenging subject.
Indeed it can be a challenging subject. Given the descriptions going all the way back to Genesis and the creation, thinking of man as a triune being, we are souls, i.e., living beings (compare the Hebrew word,
nephesh) in Gen 1:24 and 2:7), we have a body and a spirit. Blooded animals are also souls, i.e., living beings, they have a body, but not a spirit. It is in the spirit of man that he is in the image of God. Whatever qualities one wishes to ascribe to the spirit is conjecture, perhaps correct, but still conjecture.