The Role of Major League Service in Promotions

The Reds called up a player who may not have been ready for the big leagues. The rule is that if you're in the top two, you don't have to win right? He was striking out 27% of the time in triple A and as great as he's been in the big leagues so he's struck out 32% of theTime in the majors thus far. It didn't strike me as an egregious abuse does that make sense.