Question about a sentence in shadow instructions

[Chris Staub]

In the configuration section - "However, if returning to this section 
later to enable shadowing, reset any current user passwords with the 
passwd command or any group passwords with the gpasswd command." There 
shouldn't be any need to "reset" passwords since pwconv and pwunconv 
take whatever password is stored in /etc/{passwd,shadow} and convert it. 
Or am I not understanding what that means?
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