Yes I have seen it. Have a lot of his videos, like his style and way of doing things. Seems to have a very simplified way of explaining things, making it easier for beginners to comprehend as well as the more advanced users to an intermediate level. Spent the last few days trying to get someway way of sliding the adjustments into the principled shader, using a procedural greyscale has limited effect using nodes as I did, worked better with the pbr maps though, although I managed to crash both 2.78.5 and 2.8 in my attempts lol. But from my limited knowlege I believe the principled shader is designed to work mainly with maps rather than shaders. ( I could be wrong though). Have never used octane but do have prman for blender so may try that and see how it works. Need to work out how to create a map strength node/group with a single slider to indicate that strength. About to start trying it with different albedo and metal maps with eevee to see if i can get the same type of results.

Incantrix