The title is Self descriptive.
Tiled BackGround -> Add Animations
9-Patch -> Add Animations and Rotations
For example if i want create a fores background with thw wind animation using the TiledBackground. Now i have to copy lots of trees.
The best thing will be allow the sprite for use it as tiled-background, but i guess if already not is done is because some limitation or there is no way to do without mess other things, but well had to ask.