Looking at the characters on the left and right specifically I thought it was interesting to looking at the pairings Oda chose to make.
Kaido/BM = ended up as allies and 2 major antagonists of the NW
Hawkins/Apoo = both ended up being traitors
Blackbeard/Kuzan = They seem to be connected to each other although its doubtful that Kuzan is genuine
Killer/Doffy = I'll admit that I don't see the connection here
Shanks/Sakazuki = Both are endgame material, this one intrigues me the most as I think Shanks being paired with BB and Sakazuki with Dragon makes more sense
Kkd/Jinbe = Again I don't see the connection.