Don't forget Smoker. He's similar to Garp and Akainu as well.
The Marines themselves resemble a yakuza when they have their meetings. Seeing how there are 2 key Marines in the race for OP(Akainu and Coby who directly opposes the other when it comes to justice), we might get another "falling out of the family" as Marines turn on each other to create their own factions(likely just 2).
The WG and Marines got way too much firepower so this could be a way to even the odds for the final war. There's always new allies afterall.
Whatever Nudle. You're way too obsessed with power levels. Most of us are talking about character and potential plot points, and you show up with power level agenda.