I think the main thing with the R in the TNR (Trap-Neuter-Release) is that in urban environments, where there is an ecological niche for a feral male, it will inevitably be filled sooner or later.
That means that if Samoa is taken from there, in all likelihood another cat will take his place. If on the other hand, Samoa is neutered and placed back in his territory, he will still fill that specific niche and will still be the neighborhood cat. That means the chances of other ferals coming in will be lower as long as there are no new food sources.
That's why NTR is so effective - with time a stable population is created.
BTW - I find it hard to believe that Samoa is the only feral in the neighborhood - there are bound to me more. I bet they're just not dominant aggressive males so mr. horsely just doesn't see them...
My advice to him would be to get all the neighborhood's ferals neutered and released back where they live. Of course, feeding stations and proper care would be nice too.
Life with a stable and well taken care of colony of ferals in the neighborhood can be very comfortable. Less mice and vermins, no noise from fighting males, no attack cats on the prowl. Just content cats.
For people who are not true cat lovers and who are not familiar with the concept of taking care of ferals and of TNR, the idea of keeping the cat in the neighborhood sounds very strange. I think this is just another aspect where mr. horsely needs education more than anything else.
For too many years, the way to deal with feral cats was to exterminate them
Experience has proved that this is not only cruel but also extremely ineffective. The only real solution, which also happens to be the humane one, is to trap, neuter and release them.http://www.alleycat.org/ic_fs.html