Hmmm, that's interesting though. Gelatin is made from collagen too and is made from some parts of animal; bones, cartilage, skin etc. Glucosamine comes from one/some of those same parts too. Guess we shouldn't count the protein in gelatin either, then!
For over 10 years, before surgery, I was taking Glucosamine/Chondrotin (have not started back up yet). I took them because they allowed me to stop taking Advil daily (NASAID) which I had a lot of way back then, so this supplement was a big help for what my doctor says is arthritis. I was also putting some Collagen powder (type 2) in my pre-surgery morning protein shakes, during my 6 month pre surgery insurance class.
Don't think I will be adding them anytime soon but I might consider them when I am cleared for crackers for a change, when I am cleared for that...IN Moderation of course. (probably not worth the calories) Wikpedia shows Collagen types 1 thru 5 but I couldn't find how much collagen or what kind is pork rinds but they appear to be 80-90 calories and zero carbs for half an ounce of pork rinds...