Is there a deeper idea behind the two Randalls?
Claire's husband Frank Randall and his ancestor Captain Jack Randall look as copies of each other and are played by the same actor. But they are extremely different characters. While Frank is a basically kind, good guy and (at least initially) loved by Claire, Jack is very evil, sadistic and power hungry, an extremely frigthening person, the main villain of the series, it seems.
I wonder if there is a deeper idea behind this similarity in looks and difference in character. Some kind of intricate plot device. Or why did the author make them like this?
PS. Up to now, I only watched Season 1 and Episode 1 of Season 2 on Netflix, so try to avoid spoilers please :)