He's managed to dig up some pretty authentic talent when mining for gems in the past - Norman Blake, Tim Eriksen, Riley Baugus. Of course these guys appear on the marquee well below Allison Krauss or even Sting, but whatever.
He's got a ton of material to choose from here so hopefully it's not all bobby and Joanie. The fact that they've got JT singing a Hedy West song (albeit a well-covered one) may be a good sign.