[Dakota]

If I can see possession and control by the bare hand, then the "show me the ball" analogy works. In #4, however, I cannot see control since the glove is covering the ball. The case play you reference takes away all doubt with the description of the play, "F3 secures a thrown ball while it is in contact with the ground and her hand is on top of the ball." In the case play, you see the ball is secure, just touching the ground. In the OP, perhaps the description meant she also had control, but it only said she had possession. The case play does not address a ball hidden by the glove on the ground, and I do not believe you can extrapolate it to mean that.

The difference with the "show me the ball" on a tag (in my view) is that you see the tag; you want the fielder to demonstrate she had secure control at the time of the tag, and you are using loss of the ball during the tag as evidence of no control. With the ball out of sight under the glove, you don't know whether the ball was on the ground or in the glove at the time of the "tag" (of the base), hence "show me the ball" demonstrates nothing, since it is too late. That's my view, anyway.