Well, in my opinion this is just the beginning of departures from the 2011/2012 classes. I still think this class ends up at 22/23, but I do think this is one of a few guys that will be leaving before NSD. I wish Luke all the best at Harvard!
P.S. This is only speculation and the fact that it's coming from Michael Chung makes me not 100% sure what to think. This wouldn't surprise me at all though if true.