Autopsy report is above, June 3rd in "News release" in the link, full report. Tell me where it says he o.d'd. Page and paragraph.
And even though the carotid's are more forward than back, I grant you that, they are close to the centre. When you look for a pulse in a neck, you are checking the carotid, you don't poke someone in the throat to do so. Check your pulse right now, you'll understand where they are.
I don't know what to say to you about the trachea note... you'll have to be more specific.
Let's take your muscle note at face value. What happens if I lean directly on Muscle? What does the muscle do? If you want a direct understanding of what I mean, depress your bicep now, giving you bigger muscle mass.
If you are truly dedicated to this line of reasoning, ask someone to lean on a relatively small part of your arm or leg for a minute, or press it against a wall with your body weight. Tell me after that there was no effect on your blood flow. That's just a minute, two officers were on his neck and back for almost nine. (Just in case, do not ask someone to lean on your neck, I'm afraid you do not understand just how dangerous that truly is and this warning feels necessary.)