Every peerless jade physique had its own way of being cultivated, and there was no sure way of doing it. It was the only stage of the body refining realm where there was no clear-cut way of achieving it, unlike the rest where various means had been devised.
Those means may deviate from person to person or organization to organization but despite the differences, the results could always be replicated from one person to the next and from every generation to the next.
But when it came to the peerless jade physique, things run a little differently. For one, almost every peerless jade physique was unique to the owner, it was rare to find two people with the exact same peerless jade physique. The next was the results of gaining that physique could not be replicated. You could do everything down to the minutae of details but that did not guarantee you gaining a peerless jade physique.