Personally, I'd like to see someone carry with jungle AD Karthus.
But in all seriousness, I think the idea of duo jungle could be looked into a bit more, it sounds like a really great way to counter jungle. The problem is that your adc is now without a support in lane.
Its called roaming support which existed at one time and I would love love to see come back cause the current support role is a tad stale for me and it really puts peoples map awareness and need to buy wards to better levels of game play.
So sorry if you feel im busting balls ;/