Out or not out?

[greymule]

That's an out in baseball, too. The only reason the fielder shows the ball is to demonstrate that the ball stayed in the glove after the tag was made—the ball is not on the ground or wedged between the back of the glove and the runner's body. It is not to prove how much control the fielder can maintain over the ball after a legal tag.

If you see the tag and see the ball remain in the glove, you don't also need to see the fielder lift the glove to show you anything. The fielder doesn't have to "complete the play" by extracting the glove with the ball still in it.