Well I mean he has a more powerful, Energy form and it's his final form hence Shin(True/Final) Zangetsu. So if he has this more powerful form than the Zangetsu form then why would he go back? He is going to have to fight against Gaims more powerful forms.

I thought Shin meant true?

Well ya it does thanks for pointing it out. :P

Doesn't Overtime translate it as Final?

Though not perfectly historically accurate, the sashimono on Gaim's back are a nice throwback to the Sengoku period samurai. I have to appreciate it on that fact alone even if I'm not totally sold on the look yet (though it's better, in my opinion, than Jinba Lemon).

Ohhhh I'm now confused true or final, I'm just gonna go with final.

Well everywhere I see it is True
Like
Shin Samurai Gattai!
True Samurai Combination. If it were final then it would be a lie.

The only hesitation about the flags is sentai likes elaborate sticky out bits but never seems to have interest in making them work. Nothing breaks the illusion more when a so called giant robot, monster or high tech armour is flapping and wobbling all over the place. I understand they're flags, so it has a bit more of an excuse, but I still can't wait for cool moments distracted by raging shaky flags.

It actually is true. No idea why some interpretations use final, but true is it's meaning in this context.

I think you're misunderstanding. I don't mean that he'd voluntarily go back to the original Armored Zangetsu. I'm saying that since we don't know where the plot of the series is gonna go between now and Gaim's finale, there could always be the chance of something happening that forces Takatora to go back to his original form. Which is why it's still too early to count Armored Rider Zangetsu out yet.