Its undue weight if there is too much emphasis on the minority opinion  Id say its pretty obvious the majority scholarly informed opinion is that Menzies is essentially wrong and quite badly so  If theres that much difficulty finding other supporters and if so many academics are objecting to his work publicly then perhaps two critical sources is due weight and therefore appropriate  If hammering away is the norm then we should represent that hammering  Neutral doesnt mean credulous uncritical or friendly  it means fair weight to the state of the art knowledge     Wikipedias rulessimplecomplex