at what point does a 'scratch' vtv come off of its original mvc?

Hi, we are users of hsc-vtcs-vsm;

Say a duplexed mvc A12345 & A45678 has 100 vtvs written to it,  the 1 mvc, A12345  stays home, and the mvc2, A45678  goes offsite.

Say vtv #3 has 1 gdg on it , size 445mb,  and that this gdg eventually rolls off. (and rmm now shows this volser as in scratch status).

Running a vtvrpt all shows an "s" under the scrt column for the vtv that rmm has deemed scratch, however when I run an mvcrpt detail report on those

duplexed mvcs, it still shows them on the mvcs with size 445mb!   If ACS thinks this vtv is 445mb....how can this mvc eventually go through reclaim?