Being a pure consequentialist will not give off the signals that a socially acceptable person, who leans towards consequentialism, will. To predict someone's ethical behaviour, some stronger signals could be checked e.g. did the guy ask himself how to create the greatest good for humanity and then go and do that in about five different industries? If so, probably high on ethics.

The question about people skills is a good question to ask when you want to predict someone's social behaviour, but that is not the same as ethics, which empathy is often a proxy for.