Ryan, I believe you are correct on the tenon method, but I've never seen one off the stock and can't be certain. I was taught to use a single dowel, and have used one in the middle or two off to the sides ever since.
Jerry Fisher installs the tip to the stock (end grain to end grain) with glue, without a dowel then plunge cuts a channel between the two in the milling machine then inserts a rectangular tenon with rounded ends in the recess, with glue, afterwards.
Years ago part of restoring a flintlock pistol, half of the tip was gone, It was horn bent around the tenon part of the walnut stock. I made a piece of horn the approx. size, boiled and bent it to form, hide-glued it and dressed to final shape.
That is why I question anything I haven't disassembled because you might have thought that a solid horn block over a tenon if not for seeing it half-way apart.