I can think of 4.
I just find it perplexing how some folks seem to simultaneously act as though the admirals are both heroes in this and also the biggest non-Imu/Blackbeard threat that Luffy and the Straw Hats have to take down.
Mind you, I do think we might see an admiral or two turn heel (including Kizaru) in due time, but as it stands? They're not heroes. They're just as much a part of the problem with the WG as Garp is.
More to the point, if the admirals were somehow the biggest endgame threat representing the World Government aside from Imu, then wouldn't that automatically make them complicit and a part of the system that is being showcased here as part of the WG and the Celestial Dragons?
Meanwhile, if they're not complicit, the only admiral among them that you could maybe make the case of being a near endgame fight for Luffy representing something apart from the World Government would be Akainu and his black-and-white morality inherently standing against pirates, regardless of the alternatives at the World Government.