Hmmm, errrrr, looked to me like the math within those links (good info there ...) showed all sling to sling, especially of very dissimilar diameters, attachments to be weaker that those made with a connecting carabiner ... Could be the RPN ...
The #0 was around for awhile as a .pdf - released as a back issue by Alpinist ... Never quite got around to oredering one from them. I had tried Chessler's a while back - guess I will take anothwer look.
Those steep ebay prices are likely due to the fire in their warehouse last year in which they lost ALL back issues and archives . . . I am hoarding my double sets though if someone has a #0 . . . $$$!
I stand corrected . . . The sling and trigger are purple as decent light reveals . . . I have a full rack and I don't have anything between 3 and 3.8 . . .