
If the killer had manhandled Paul Stine's upright body around the shoulders, from the driver seat to the right side of the taxicab, with his head falling into the passenger footwell, he probably received some blood transfer to his hands. So when he gripped the left side of the shirt with his left hand to create tension, he very likely transferred this patch of blood just above the cut line. There is very little reason why this blood staining should be present on this area of the shirt, other than from the hand of a killer. Medical personnel would have arrived at the crime scene with clean hands and pulled Paul Stine around his shoulder area to extricate him from the passenger footwell (to his position shown in the below crime scene photographs). There would have been no need to grab the lower half of Paul Stine's shirt to lever him from the footwell.

The autopsy of Paul Stine began on Sunday, October 12th 1969 at approximately 9:30am, when photographs would have been taken of the fully clothed body, before they were removed for a more thorough examination. The clothing was then dried, given an identification tag, photographed, and then turned over to the property clerk's office to be secured. Unless some unauthorized person gained access to the body in the eleven hour window before the autopsy, or knew the location of where the property clerk had secured the clothing, there is practically no way a nefarious actor could have gained access to the shirt, to have mailed it within the next 24 hours or so. The practice of making up a story without evidence or justification, to then somehow attribute validity to it because nobody can disprove the story, is common and flawed reasoning in the Zodiac community.
AN INITIAL CUT TO THE LEFT SIDE [PT1]