"Yes, but what is 'it'?" Really the question that was bothering Ianto, even if he took a roundabout way to get to it.
"Why the particular people who are here, from the timelines they're from? Why the particular points in time that they're taken from? Are they really taken, or are they sent, or do they come here knowingly? There's no connecting factor between all of them."
He paused, considering. "Connecting a number of them, yes, but not all of them. And you're the most common connecting factor. The Doctor, as well, I suspect."