If somebody adds an unreferenced template we can t just delete it That s not nearly as bad as say removing an AfD template from an article you don t want deleted but still Ignoring the template can result in some admin walking by taking objection to a completely unreferenced article and putting it up for AfD The fact that the other articles haven t had that happen to them doesn t mean others won t As for why the template got added in the first place when other articles haven t you ll have to ask Powergate if you want an answer on that end