One of the greatest impediments to sharing knowledge is a common set of definitions. Even among engineers like myself, different folks call the same thing by different names. In this particular instance, I don't really side with either you or Bill.
In your favor, "power" is the correct word given to things that have units of length*force/time. This is volumetric flow rate * deltaP. Bill uses deltaP vs flowrate to characterize blocks and is not particularly concerned with what this means in terms of power (me putting words in his mouth, mind you). This is likely because of the reasons I outlined above for ignoring this aspect of blocks.
To me it really comes down to the basics of doing an energy balance on the "box", which is the water block in this discussion. So long as you take into account all the energies involved and clearly state what they are and how they're determined, it's all good. Your thread here discusses one of the energies involved that most people haven't got a clue about and I'm glad to see it debated a little.
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