While alive the Buddha and arahats had ceased all the links of the paticcasamupada?

You mean that khandha paribbanna and the consciousness of the living arahat is the same?

That is quite wrong. I cited the term samuccheda-marana (death as cutting off)and that is the ending of all consciousness. Unlike with the non-arahat there will be no patisandhi citta, no rebirth. The job is done. However the living arahat still has vinnana khandha.

I wonder if some of your ideas have come from sources like in this thread (apologies if there is no relation).

Also see here where venerable Subhuti explains the errors. The Dark Side of Ajahn Mun's Biography | American Monk: Life with Buddha, Dhamma and Saṅgha