Agreed. I think Kev is pretty much in Troll mode for the past few years. no point talking to him anymore
Actually, by reading this, I would say you are not clear on what concept/princple means. In your example, drilling an arm bar is drilling a technique only. In this case it is neither concept or principle - it's just technique
It's only when you focus on and understand how/when you apply it and what theory is behind how you get there that allows you to understand and drill the concepts based upon given principles - and you can focus on these at the both the drilling level and in sparring.
Or you can just drill/spar techniques alone without any concept/principle.