use og not for all its potentiality (for now) but only for this small case:

I am the admin of a site and create a viceadmin;
this viceadmin can to create own users , example user1, user2, user3, user4

in the site there is a vocabulary so:
PRIVATE VOCABULARY
-term a
-term b
-term c
-term d

this is a vocabulary that only viceadmin's members can to access:
and viceadmin can to assign the access :
-term a visible only at user 1;
-term b visible only at user 1, user 2;
-term c visible only at user 3, user 4;

so he (viceadmin) can assign at own users the access at specific terms .

is there a steps steps how is possible to do this?
so in my case isn't necessary to have a list of groups, home page groups etc..;
the gorup's content ..;

so, to use OG only for the viceadmin for assign at users access at some private terms.
thanks