But it could just be that its a necessary evil considering the presumed necessity of such a thick insulation necessary for the system, and the presumed necessity of the geometric center of the system for the KC, hence making the long AP plug removal job unavoidable. But I suspect, in keeping with the 'prefection' of the system, there might be more evidence of a specialized chamber below the AP to facilitate a 'jack' system.
Because based on the water pump function of the lower chambers, I suspect an odd shaped void below the AP plugs wouldn't do any harm to the system if it were simply full of water at the equilibrium of the system. So I have distracting doubts.
Tough one to comprehend with potentially missing pieces. grrr.