Well, I quite like the idea of Tony maybe meeting a young marine Gibbs - time travel type story. Especially if Gibbs was, as Ducky said, very like TONY when he was younger. Sort of wild and reckless and smart mouthed and a bit obsessed with sex *g*. Although what we saw of young!Gibbs in Heartland seems more like old!Gibbs in terms of being intense and quick to anger and unforgiving but combined with an essential vulnerability and a good heart.