On the red carpet at the Golden Globes, Variety spoke to Milo Ventimiglia and asked him about the mystery surrounding Rory’s baby daddy:
I don’t think it’s any of the three guys at all. I don’t know. You know what, I haven’t really sat around and thought about it, wondered who it was, so I’ll be as surprised as anyone else is.
— Variety (@Variety) January 9, 2017
I have my own theory that it’s the Wookie. And the Wookie is…Marty!
Still, I can’t quite remember if Marty professed any proclivities to either cosplaying Star Wars or being a furry. We do know that Marty is capable of odd behavior in relation to Rory, given the way he pretended to Lucy he didn’t know Rory. So it’s not a stretch to think he didn’t reveal his identity during their encounter. He might have thought that disclosing this would have ruined his chances with her.
Anyhow, I always liked Marty and forgave him his odd behavior, chalking it up to his being devastated over Rory’s rejection.
Of course, just about any male on the planet could have been in that costume. Which doesn’t narrow things down a bit.