Every single year, on every single team, fringe players compete for the last spots on a major league roster. Utility players, bullpen arms and sometimes even starting position players, on some teams. A horrible spring by one player may open the door for another player, at times. This Tiger team, this season, has most of it's lineup set, there is little competition. CF may not be handed to Meadows, it may be Javy out there on opening day. I really like the defense and speed Meadows brings but he has to hit, at least a little bit. If Kevin does make the team, he won't sit on the bench, he'll be our starting SS. And that opens the door for Javy to play CF. We'll see what happens....
Your question doesnt have an answer unless you specify which players, which position or which team. A starting player like Riley? He's our starting left fielder, no matter what. Of course, unless he's injured.