I Agree
I Disagree, Hp is what spins the dyno, water brake is a job and it takes power to do that job,
All power is the combined effort of rpm and torque. Yes while the engine is doing it's job a dyno can only measure torque at rpm (which is power).
Just like electricity it takes a certain amount of watts to do a job and is made up of a combination of volts and amps and all three are always present and link, just like hp, rpm and torque.