Tvad with most shotgun IC's, the shield is connected at the arrowhead end, which is why if one connected all their source-to-preamp pairs with the arrow pointing to the preamp, all the shields would drain to the preamp's ground, which is what you want because it's the shortest path to ground without any loops; AKA "star grounding" with the preamp being the center of the star. This scheme works of course as long as the preamp is the only component that's connected to panel ground (thru the wall socket) and also if you remember to point the preamp-amp IC's arrows to the preamp also.
I learned of the Purist and Magnan deviations in discussions with Jim Aud of Purist and Dave Magnan. My conversation with David was so long ago, I can't remember what he told me other than that his (single ended) cables had several ground conductors connected at opposite ends (was he foolin' with me? who knows!) Jim Aud simply said that he felt the cable's shield should connect to the "quietest" ground, which to him would necessarily be the component end (a real head scratcher as far as I'm concerned!) and therefore his shielding is connected at the arrowTAIL end of his SE cables. But both of those are exceptions to the rule; and just to confirm your conclusions, I also point my Purist single ended IC's toward the preamp and think it sounds best that way too.
I learned of the Purist and Magnan deviations in discussions with Jim Aud of Purist and Dave Magnan. My conversation with David was so long ago, I can't remember what he told me other than that his (single ended) cables had several ground conductors connected at opposite ends (was he foolin' with me? who knows!) Jim Aud simply said that he felt the cable's shield should connect to the "quietest" ground, which to him would necessarily be the component end (a real head scratcher as far as I'm concerned!) and therefore his shielding is connected at the arrowTAIL end of his SE cables. But both of those are exceptions to the rule; and just to confirm your conclusions, I also point my Purist single ended IC's toward the preamp and think it sounds best that way too.