Europe gained control of the showpiece event by opening up a four-point advantage over USA on day two at Gleneagles.
Speaking ahead of the final day of play, McGinley gave an insight into the relationship between Europe's contingent.
"Personality is a massive part," he told reporters. "Henrik [Stenson] and Justin's [Rose] partnership came along because of personality more than golf game. There's a particular reason why they were together.
"There are other guys who need a little cajoling and like to have somebody a little bit spicy on their shoulder. That's a huge part of it, that ability to just gel, that X-factor, that relationship between two guys is important."