There's a million hidden pieces of knowledge that only exist in our minds at this point. My Phd thesis is actually addressing this problem in some context. My goal was to flesh out the wiki and document them all, but these questions help fuel that motivation.
Yes like said, the Grape Gascans and Violet Riddles, which not having the stretch logo, were subject to the same sales requirements (only surf/skate shops) as the Stretchline.
As for the Square O/Frogskins classifications, they are all Frogskins, but some also fall under the Square O, and Ellipse O sub-catagories.
One of the confusing thing while following the Oakley History, is trying to makes heads or tales of all the classifications. Frogskins and Jackets were for a while fairly distinct. Frogs lacked Unobtainium and were a lot cheaper, while Jackets had ear socks, nose bombs, and often took a different design route. Then the XX's came out and due to the naming convention, where added to the Frogskins. The Bottlecap has no ear socks, yet was added to the Jackets (technically the catagories were getting muddled at this point anyway.) Then we have the Dartboard, which looks more like a Zero class, but the website listed them initially as a Frogskins, but the box states them as a Jacket.
At around that point, the two catagories weren't really mentioned, and it simply became O Matter. This posed a problem for the future models, since I had to either start guessing, or figure out how to classify them. I guessed for a bit, but then made an O Matter group. This was fine for a while, but then the Acetate frames came out. The oakley website still listed them in the O Matter group. I decided to break them out, but after that the Riddles were all by their lonesome and it seemed silly to create a group for one model. I found out that the Halo's were also Acetate, but were assigned to the Frogskins group, so I abandoned that and put the Riddles into the Frogskins.
Then the Stretchline comes out. I create a new group for that, but keep the Wardens in the Wires. Here starts the conflict between two competing groups. The stretchline built up over time, and the designs were unique enough to not cause much of a confusion between Frogskins and Jackets, and thus warrant their own group. Then the Stretchline group was canceled, and turned to Square O. I did at this point receive word from someone at Oakley, who gave me the official classification, and I found out that Frogskins and Jackets were still being used behind the scenes and that the Square O models were for the most part all Frogskins. I moved the old stretchline pairs into the Frogskins, but kept the Square O in their own area.
In truth, I should move those to Frogskins as well, but I just haven't gotten to it yet.