It can be tough at the best of times identifying plants from photos.
Meanwhile, I'd guess 1 is K. blossfediana, 2 is K. delagoensis. You may struggle to get species ids for some of the other plants based on small pieces of stem only. If you can shoot these again, maybe in bright shaded daylight, so they are well lit without distracting shadows, it could help.
Orbeas and Huernias are almost impossible to ID without flowers. I think you are right that they are Orbea and Huernia, but which ones are impossible without seeing flowers.