Oggers, it was actually your second post in which you said the following:
in your 'brakes on' scenario the aircraft is still producing 200 THP as well as 200 BHP because it is accelerating a mass of air rearwards
But you were wrong, because you were confusing THP with the power that is being wasted in the propwash. You have then gone on to repeat this mistake thorughout the majority of your posts in this thread.
In the brakes on condition we have:
Propeller power output = power being wasted in the propwash.
In flight we have:
Propeller power output = THP + power being wasted in propwash.
As we accelerate from zero, the THP gradually increases while the power being wasted in the exhaust gradually decreases.