I wrote:
"Critical coupling is defined as maximum energy transfer at the resonant
frequency."

Also:
"Coupling additions (more loads) to a feedpoint lowers the impedance
unless additional measures (transformations) are taken."

I`ve since consulted Terman, and critical coupling is defined as I said
above. Terman adds coupled elements differently than I did above.

On page 64 of his 1955 edition, Terman defines critical coupling as:
"These trends continue as the coefficient of coupling is increased until
the coupling is such that the resistance which the secondary circuit
couples into the primary at resonance is equal to the primary
resistance. This is called the CRITICAL COUPLING and causes the
secondary current to have the maximum value it can attain."

On page 65, Terman`s statement supports Art:
"When the coupled impedance is added to the self-impedance of the
primary circuit, the effect at resonance is to increase the effective
primary resistance above the value that would exist in the absence of
the secondary. This causes the primary current at resonance to be
reduced in all cases by the presence of the secondary."

I wrongly assumed a coupled load would add to the primary current. I
apologize to Art and to others who I misled.

Best regards, Richard Harrison, KB5WZI