There are many cases which confirm that it is not to the point that the Minister as personal non-compellable discretions that could bring about a different result.
See eg NBNB v Minister for Immigration and Border Protection [2014] FCAFC 39; 220 FCR 44 at [107]:
…it is not relevant to this circumstance that four of the applicants are (like NBMZ) in community detention or that the Minister has discretions under the Act which have not been exercised.