Minecraft 1.8 Map Saving Player Coordnates

So in the new snapshots for Minecraft 1.8 you can use the "@e" command to teleport entities. So map makers can use this command to save a player's coordinates and still be somewhere else doing something else. So, here is how it works:

NOTICE:
1. You NEED a constant redstone signal to make this work.
2. The cow is named Cow.
3. Cow is given slowness (command at the bottom).

Command Block 1: Teleports cow to player.
Command Example: /tp @e[name=Cow] @p

Command Block 2: Teleports player to designated coordinates.
Command Example: /tp @p 1556 58 1305

Command Block 3: Teleports player back to cow.
Command Example: /tp @p @e[name=Cow

Command Block 4: Teleports cow back to holding place.
Command Example: /tp @e[name=Cow] 1559 58 1305

Command for Cow Slowness: /effect @e[name=Cow] 2 1000000 50