I would comment that I think you might be making a mistake by majoring on Octane. Logic suggests that any collection of materials for C4D should have, as its starting point, a native C4D set. You can also have your Octane, Vray, Arnold etc versions sitting along side but there should be a C4D native set given that that will be the most used render engine. While it might be easy enough to distribute the textures amongst the various channels, you're making a giant number of potential customers jump through hoops that they shouldn't have to and that's going to put a great number of buyers off at the first hurdle. Further to that, while I have no idea of the actual figures, my guess is that Octane is one of the lesser used engines for C4D, on a par perhaps with Arnold, so it could be argued that the order should run something like C4D native, Vray, Octane, Arnold, other.
Great set of texture, all the same. This set will definitely be at the front of my mind next time I have some stone in a render.