To me personally the phrase "aloof with strangers" means the Cane Corso, or any and all being's be that animal and/or human for that matter, that are considered to be aloof, are simply physically and emotionally detached.
Taking the example of a Cane Corso, or any other breed of dog that is considered to be aloof, to me would mean that he/she would observe a stranger from a distance but always within view. Therefore, declining and refusing to partake in any invitation whatsoever on behalf of any stranger thats pertinent to any acts of and/or suggestions of friendliness. No amount of coaxing or friendly banter on account of any stranger will allow for themselves to put in a situation where upon they will be completely at ease in the company of such persons.
They may appear to be any and all of these; Casual, Detached, Distant, Incurious, Indifferent, Laid-back, Reserved, Stand-offish, Unapproachable, Uninterested, Unresponsive, Unfriendly, Unsociable, Withdrawn, Disassociated, Conceited, Disdainful, Contemptuous, Impassive, Unpreturbed, Unemotional, Unexcitable, Unflappable, Unmoved, Unruffled, Lackadaisical, Unwelcoming, Hostile, Icy, Impertinent, Impudent, Insolent, Averse and Derisive. However they will always be at the ready to dispose of any threat or foreboding situation that a stranger may place apon him/ her and their extended human family, and in any way that they see necessary to counter act any such foreseeable provocation.
And to me that is the ideal. If I could have a dog that was mindful of his own business when it comes to strangers and only interfered when given the ok or when absolutlely necessary I'd be wrapped.
As I previously stated this is only how I construe the phrase "aloof with strangers", and how I believe in my opionion an aloof dog should act. Having said that I am by no means an expert on the Cane Corso, I am in fact an amateur when it comes to this breed. They're only very new here in Australia, hence I do not know if this is how a Cane Corso's temperment is or should be. I would love to know if I am on the right track though.