I've been wondering whether Padan Fain was the only 'hound of the shadow'. The case against is strong. Recall how he brought the Trollocs to Emond's Field in EotW, just when Moiraine and Lan found the boys. Moiraine was going off of a list of names, prioritized somehow. In the 'New Spring', we've learned that the Shadow didn't have this list. They didn't know when Rand was born, thus killing lucky men and boys of various ages. Yet somehow, the Shadow managed to find this single random hamlet in the middle of nowhere just in time.

One way to explain this odd coincidence is via the author's license ('cause he said so). But Jordan is known to have backstories for every oddity to give the story maximum depth and realism. So another explanation is that the Shadow had many 'hounds' attuned to t'averen scouring the land for Rand, and when Fain found Rand the year before Moiraine's visit, he sent the subsequent events in motion on the Shadow's side.

If that's true, what happened to the other 'hounds'? Of course, Fain became extra special after merging with Mordeth, but there must be other hounds still searching for Rand, loose in the world and unable to stop in their mission (probably running from one gateway location to the next).

I wonder if we have seen any of them on-screen, or whether we will.