For the purposes of this Division, if:
(a) an ADI (the first ADI ) is acting on behalf of, or at the request of, another ADI (the second ADI ); and
(b) the second ADI is (whether or not as a result of one or more previous applications of this section) acting on behalf of, or at the request of, a person who is not an ADI;
the first ADI is taken to be acting on behalf of that person.