I looked up that bounty poster thing from Chapter 77 Greg mentioned in the video and found it:
You have to zoom in to see it, but it is indeed there.
Upper-left: Rayleigh? - Middle: Fisher Tiger? - Bottom-right: Robin?
The guy in the middle also looks a LOT like Fisher Tiger (Greg says it's Krieg, but I would think it would match his actual bounty poster if that's the case considering we've seen Krieg's poster before the poster in this panel). Some mindblowing shit right there.
Did Oda get struck by lightning and had a 20 year long story in his mind when he woke up? The hell is up with that guy? Pure genius.
They probably were just random characters at that point...right? Right?