You know people keep saying that Fujitora doesn't want to stop Doflamingo, he just wants to save the civilians from the bird cage.Unless the guy can teleport, it would obviously take him more than ten minutes. Just from this post, it seems as if you're assuming that (a) our dear Admiral knows about Doflamingo's current condition, (b) that Fujitora's gravitational-based powers wouldn't be restricted under these circumstances, and (c) that a restricted Fujitora could take out (as far as Fujitora is aware) a good-to-go Doflamingo in less than ten minutes, or even as much as half an hour.
So two or three swings with his sword, then?
First of all, you don't know what nerfing means. Secondly; yes, Oda's writing has flaws - even though rarely - but this is not one of those times. It's already been explained why Fujitora won't fight Doflamingo himself. You see stuff like this in war all the time-- not that I know a sh*t about war, but just bear with me here. There are times when soldiers abandon their mission to save their squad's skin, knowing fully well that failing that mission could potentially cause hundreds, if not thousands of other deaths. Sometimes someone's beliefs just stride against what's smartest. Fujitora don't plan on playing the Marine hero. He wants to protect the Dressrosians his way, not by fighting a guy with unbreakable shades, but by stopping the shrinking cage. Is this so hard to understand?
His own ideals are stopping him. Also, let's not forget the limited amount of time he's got, with his limited power. There's the distance, as well, but I guess that's arguable.
You do know that Fujitora is "technically" on Doflamingo's side, right? Fujitora's got orders, too, you know. He's there to help Doflamingo, because the latter demanded it. The World Government, afraid of the threat Doflamingo poses, respond to these demands. Now that the Birdcage is up, Fujitora can't contact HQ. This is why he's still following his old orders, because there aren't any "new" ones. This was made clear inYou must be registered for see links. According to Doflamingo, the Marines won't attack them-- even after Doflamingo put up the Birdcage and started massacring people, Fujitora decided to follow orders. Solid enough reason for you?
But here is what they leave out, the only way to stop the bird cage is to take out Doflamingo, because they are just buying time to delay the bird cage, it is still shrinking, and when it gets going, all the civilians die anyway. Making all this protecting the civilians completely pointless and irrelevent.
So the only real way to protect them and to save them, is to take out Doflamingo.
The truth is, that the author needs an excuse so that Luffy is the one that takes out Doflamingo, and while I understand that as Luffy is the main character he will be the hero in the end, the author could have given Fujitora a much better excuse then, "we don't play god, we just protect civilians," when the only way to actually save them is to take out Doflamingo.
As for orders, Smoker turned out Crocodile by his own free will, and Fujitora turned on Law without orders, once he heard that Law had allied himself with the Straw Hats, he just said, "okay, you are under arrest and are no longer a warlord."
If he can do that, he can turn on Doflamingo with Doflamingo trying to kill civilians and even marines.