Over the past week, a few major prospects have been called up to the big leagues such as Paul Skenes. Prospects also sometimes end up being sent down just as quickly as they get called up. Tyler Black was called up but sent back down when the Brewers activated Christian Yelich. When it comes to which prospects go up or down, there are a few factors that play into these decisions.These decisions are different from team to team. Some teams feel a player is ready while others want to try to stay ...