King and pawn vs. king - teaching methodology

Pardon the blog-peddling, but I thought teachers of young players might be interested in these KPvP positions. (Posted for the teachers’ strike, which is now blissfully over.)

http://www.chicagochess.blogspot.com/2012/09/king-and-pawn-vs-king-chess-homeschool.html

Two others that I might have added:

A) White: Ke6, Pd6 Black: Kd8 (either side to play) - the winning version comes from Position 2 naturally; the drawing version comes from Position 4 naturally.

B) The Drtina study - White: Kd1, Pc3 Black: Kf8

The Wikipedia article uses the Drtina study to illustrate the principle of key squares, which I find more useful in teaching kids than the opposition (though obviously you have to teach both, eventually).

Basically looking for a critique - what should be added, what should be left out, what order? Consider the audience to be bright 8-14 year-old players.