He may do very well in a new colony..which is what a ten cat home is. He was a stray, correct? He is used to finding his pace in the order and ,for most males, that means fighting...most fights are more noise and flying fur than serious damage. If the adoptive home has a strongly established power base, he may have fewer problems than in a one or two cat household because he will be taught by the others where he fits.

Dominance in a colony is a complex issue. While it is often males who appear aggressive, acceptance or denial to a new member often is signalled by the lead female...and the males take a cue from her. They can make alliances as Catmandu describes where a relatively non-social male will bring in a young one and "sponsor" him/her.

I've lived with and obsevered cats all my life (I'm 48 and spent much of my childhood on the back pourch and in the sheds with ferals and working barncats). Their social arrangements are usually tolerant if there is enough room for private retreat and enough food.