A male calico can only pass on one color, not both like females can. So if he passes on the red, and breeds with a dark (or calico who passes on the dark gene) female, the female kittens will be calico. If he passes on the black, and breeds with a red (or calico who passes on the red gene) female, the female kittens will be calico. Male kittens only get their color from their mother. Any reasons for a male to be calico are not genetic so he wouldn't pass any of that on to his offspring. So as far as what he passes on, he's the same as a red or black male (depending which one he passes on). That is to say, IF he's really the father of the neighborhood litters. Without controlled breeding or DNA testing there's no way to know.
And, yes, it's irresponsible to allow an intact male to roam freely. Statistically speaking, most of his offspring end up homeless :/.
And, yes, it's irresponsible to allow an intact male to roam freely. Statistically speaking, most of his offspring end up homeless :/.