People think that the even though Sengoku was an Admiral and it is the natural progression of the military that they wont cut there offensive powers short by promoting an Admiral. Still it makes sense that Akoji not become a FA in the sense they dont get alot of combat use. Rubber is weak against extreme cold it becomes hard and brittle, making Akoji the best matchup against Luffy. Akainu due to the extreme heat he produces would force Luffy to be more elastic and he wont be able to pull himself together so as far as a match up to Luffys DF is concerned they are the biggest ones. Kizaru just doesnt seem to care one way or another about dark justice or akojis lazy justice (although he seems to lean towards the dark) and thus having him take the initiative and place HQ in the new world seems out of character. I still say that Akoji wouldnt do it either because he is to lazy but others dont agree. Many think that ee
If Oda will shock us IMO it will be an unnamed VA and we have 6 of those, but I still think we will see a VA move to admiral and another unknown VA who was promoted from RA. I think the SH will end up clashing with the G-1-G-5 so we will see them fight plenty of VA's on the way to glory
^I think what he is saying is that he will replace one of the 5 members for some reason and thus maybe we see Sengoku be promoted, we still have yet to see Sengokus DF form so it would be nice to put him in a position where he might clash with Luffy. Although, he is showing signs of questioning his leaders decisions such as hiding the escape of dangerous pirates from the public, so I doubt that would happen.