Trying to read too much into the performance of players this early in spring training is kind of a fool's errand. Sometimes the starting pitcher wants to work on fastball command and throws nothing but fastballs. A hitter might be working on a swing adjustment, or hitting to the opposite field, etc. Additionally sometimes you have a pitcher from A ball throwing to major league players. Bottom line is that early in spring training it's hard to know what you're looking at.
I've seen Jung in a couple of games on TV. Looked good in one, less good (but not awful) in the other. It's really just too soon to get either excited or concerned. Mid March is when things start getting more obvious.
“I cannot undertake to lay my finger on that article of the Constitution which granted a right to Congress of expending, on objects of benevolence, the money of their constituents.” - James Madison