Z/B and D/C have both been together since 2011 yet D/C have already been national champs, 5x grand prix medal winners and 4C silver medalists.
Z/B have beat D/C by .29 points at this year's nationals....they have one national bronze and no international medals.
That's probably what prompted the tweet not to be surprised at who's going to the Olympics. It would be nice if the world was "fair" but they will sent whoever they think will win the most medals for the USA end of story. It may be Z/B it may not. Either way both team can certainly stay until 2018.