You said that he uses CoO to get around, so how is he not using it all the time? When birdcage happened, he was saying the he can physically hear the voices that's been going on. You're basing that silhouettes on the premise that it must be CoO in which it can simply mean any his heightened senses.Issho may not use it all the time but he saw auras like Usopp did. Plus using it for something like seeing might not be that taxing especially for someone at the level of characters who fight for 10 days especially when he gets to sleep each day where he's not using it.
On top of that there's the moment when he failed dodge G3 Luffy's elephant gun so i'm finding this really hard to believe that he as CoO.
Yeah I know we don't see the strings but you do see that luffy and sanji were held in the same way, right?As for Luffy we still don't see any strings there, we only know there was more than one because when Luffy broke free "snap" was written two or three times.
On top of that with King Riku who was control with a slightly different finger motion still had more than one string even attached to his limbs too.
I think Kings haki requires more aura/stamina because it's so powerful. I also have this theory on that the power of kings haki is so powerful that it can overwhelm people to the extent that they lose their sense to change in form correctly (logias won't be stable enough to go intangible), lose their calm (observation haki will go down), and lose ambition to full their will/aura (armament gradually wane down) through the power of overwhelming someone deflecting all 2 other colours as well as logia users that change shape to be invisible. As of now it's just a theory but because that haki is superior then the rest and the Dark King was unable to spam it, there must be more to it.What about this though, Kings haki requires more aura and stamina than the rest of the haki because it's superior and unspammable...I believe that all 3 colors use the same aura/will. Do they all use the same amount of haki per usage or does kings haki use more per usage?