Don't know about Samurai but it depends on the design. A
slip ring is a way of connecting power and control wires to a rotating part and maintain the connection at all angles.
For example, you can see it on this pic of Funk'n'Fly. The yellow part in the centre:
Source: Escapism Project
It is basically metal rings around the circular part and brushes that connect to the rings, like this:
Source: Motion Control Tips
It's conjecture on my part but I'm guessing Croc Drop doesn't use this approach because if it did, it could park in any position.