I think the bottom staple is detached, that is a major downgrade. Also, what you called a Marvel chip on the top, is not a production issue(Marvel chip) but a real chip. Spine split is always a big downgrade, that tear in the upper right is quite long, sub crease is a huge downgrade, and the Tan Page reference is a killer. It all adds up to a very low grade book but I do think the detached staple pushed it into below 2 territory. As suggested, read the notes that should have come with it. I also think you need to educate yourself on grading, the CGC way. The good qualities about the book don't matter = they don't add points to the equation.