aviation watcher,
If one were to tail another aircraft's radar shadow not only one needs military pilot skills especially when flying in the night (when one can possibly only see the tail lights or wingtip lights only) but also have the communications systems in "ON" mode to receive updates on exact flight path of the aircraft ahead. Given that all such equipment were switched off - this seems too unlikely.
Why do you assume that? Do you have much formation time, especially over long routes? I've flown across the Atlantic without the foggiest notion of the navigation, just when I needed to refuel.
GF