It is an extremely long arc, but it was the best of the series imo. I picked Usogui back up after missing a whole arc or two and personally found the Protoporos arc gripping enough that I followed it religiously all the way through to the end of the series.
This meetup is just some gambler with heart problem, and another guy with identity crisis also with Alzheimer and the blonde dude is just an average jewish business guy who have a fetish with diamonds