We can't really say.The only one we've seen using FGT is Ichigo.Isshin mentioned it but we don't know if he lost his powers or not.Atleast we've not seen him using it.Anyways thanx for the rep
How do we "not" know that Isshin lost his powers from doing FGT? I thought it was pretty much manga fact that there was an event around 20 yrs prior to Ichigo's story that took all of Isshin's shinigami powers. & then when he tells Ichigo about the FGT it's pretty much assumed that that is what happened to him. If he had to fight that vast lord thingy that is obviously what Ichigo's inner hollow looks like, it goes without saying that he is going to have to use some major technique to beat it.
Also...to the other posters on here....yes the hilt of Zangetsu is a swastica. Did you just take a history class and notice the banners hanging up behind Hitler? but honestly, the swastica is one of the earliest created symbols made by humans. It has good meanings, thats whyu the Nazi's used it. It helped rally individuals to their cause. Look at it like a windmill or ever turning "wheel" of progress....Just like Ichigo and the energizer bunny! They keep going and going and going...
SORRY! CONNECTION PROBLEMS CAUSED A DOUBLE POST!