Board Thread:Questions and Answers/@comment-38947763-20190921181204/@comment-39718735-20200525005825

Kingasdfg wrote: We never see Ball Breaker summoned from Gyro, nor do we see anything indicating Gyro has any control over Ball Breaker after the steel ball is thrown. Ball Breaker always manifests from the steel ball, and only when the Super Spin is being used. No other Stand has this kind of limitation on being summoned except Tusk ACT 4, and that's just to use one aspect of Tusk rather than being integral to its use. Gyro did summon it the moment he threw the ball imbued with the Golden Spin. So why would Gyro need to have full control over Ball Breaker for it to be his stand? Shigechi had to order Harvest to throw away the coin Kira had converted into a bomb instead of just doing so to give an example. Heck, not even Jotaro or Weather Report have absolute control over their stands (they will passively avoid their users to kill themselves). And there are several stands whose use is conditional as well, D'arby can't just use Osiris, someone has to lose a bet against him (who knows, perhaps it's just another ability stand as well), Boy II Man can't be used unlike he wins a rock-paper-scissors game. Those two would never have discovered they had stands unless they’d perform those very specific actions.

You can actually see during the Mandom fight that Gyro summons Scan briefly. It's definitely a Stand, not just an ability, and one that Gyro himself seems to summon. A third possibility for Ball Breaker's identity (that I forgot to mention in my original post) is that Ball Breaker is an upgraded form of Scan, powered up by the infinite rotation the same way Tusk ACT 4 is.  Unlike D4C or Tusk (another two stands awakened thanks to the corpse parts) Scan is fully based around it's corresponding part of the corpse (an eye of the corpse), The eye just probably just "forced out" Ball Breaker's true form (as some sort of foreshadowing) and integrated itself on it. By the time he lost the eye since that stand was fully based on it he lost it, just like when Lucy lost Ticket To Ride since it was a stand created entirely from the corpse, not a stand awakened on the person.

If a Stand can be used by more than one person, it's not really "their" Stand, is it? A Stand is a physical manifestation of a person's unique, distinct, energy, and Ball Breaker is not that. I don't buy that Hermit Purple is the Stand of all Hamon users, because that opens up a load more questions that don't make any sense. So the same is true here, if a Stand can be used by anyone who masters a certain energy (Hamon, the Spin, etc.), then it's the Stand of that energy and not really the individual. That's Occam's Razor kicking in.  Yet we have more evidence about Hermit Purple being "the hamon stand" than against it. I'd say it can be sorta natural, if someone masters a combat style like that they learn its philosophy, learn its movements, dedicates so much time to it... I'd say in some sense they become so attuned to it they can only develop the stand of the ability cause it's the only way to fully complete the mastery over it (well, more like go beyond it). What would happen if, let's say Gyro learns hamon or Joseph learns spin (or even someone unrelated to those techniques like Jotaro learns hamon) is totally unknown.