you have to question some of the characters in the manga right now.... first the marines call an end to a war at there HQ which saw them suffer.... no losses at all? nothing, not one single person of note took any real damage during that fight, whitebeard was dead, ace was dead luffy was passed out and shanks demands an end...

Sen goku should have suggested whitebeard pirates and marines both join forces in order to execute blackbeard, an outcome that surley would have also pleased shanks. Instead they let blackbeard go, allow the whitebeard pirates to gain an incredible martyr figure head, Show to the every marine present the strength of shanks is roughley equivilent to the ENTIRE marines forces stationed there (since we know the white beard pirates would have went for blackbeard not the marines).

Next we see blackbeard running away from akainu... where is the sense in this? although he was clearly trying for some kind of trade for a ship was it impossible to think that perhaps the blackbeard crew featuring a captain that has captured the power of the former strongest pirate in the world, several people whoms actions, power and influence is so great that there entire exsistance was removed from the world along with other notable figures from the original crew would have been able to take down akainu?

Its weird that the squad captains from WB pirates fought almost equally with the marine admirals yet white beards entire crew runs dispite having the advantage of it only being one marine with a load of pissant no names on his ship. Are we to beleive that for example blackbeard would also run from marco and his merry band?

Just a few questionable decsions being made now.... akoiji being fleet admiral is not one of them though. Clearly from sengokus example the head of the marines no longer takes the field, this is also evident because garp refuses promotion. If the marines lose akainu it would be a bigger lose than if they lost if they lost the lazy akoiji IMHO. Seems akainu can beat almost anyone in a fight irespective of ability