So throughout his fights he seemed to be exerting something quick tasteful that made the Hollows around him go beserk, and even attract themselves to him, such as the Grand Fischer, which manifested something of that of a girl to lure Ichigo to save it, and then have it "Kill" Ichigo is hopes of taking his powers for himself, and grow and become powerful but was stopped when Ichigo's mother intervened, and died in the proccess! Therefore passing the hollow power into Ichigo...or should I say transfer her power into him to save his life, therefore passing Juha Bach into Ichigo to protect him, but in doing so also transferred the Hollow that resided within her into him too.
Isshin probably knew this since he felt his power return and obviously made it his goal to seal Ichigo's power so that he would lead a normal life.
Now fast forward to when Ichgio was seeing ghost, meant that he was slowly starting to break the seal that was planted into him by his father! Which also meant that his Hollow powers were starting to manifest themselves, as too were his Quincy powers. In the case of Karin and Yuzu and how their powers were slowly to manifest themselves! And I also believe that they have Hollow abilities within them too...but we're talking about Ichigo here so let's continue.
Ichigo being that he was seeping Hollow powers, fused with Quincy was attracting hollows around him, which brought the attention of Soul Society in sending Rukia to patrol the area and upon meeting her and transferring her power to him meant that it broke the third seal withing Ichigo giving him the power of awakening his Shinigami powers later.
In doing so sent the whole of Soul Society in search for her sending her brother and Renji her friend to bring her back, with Aizens command of course.
When Ichigo meet Renji and Byakuya at first glance something just didn't feel right about Ichigo, even at first glance he seemed to be seeping something rather peculiar to that of raw a malicious reiatsu...uncontrollable and quite nasty, yet being that he was still developing his Shinigami abilities, meant that his body was still in activation of his other abilities, yet were cut short with Byakuya doing the honors, and taking Rukia back to Soul Society.
SOOOOO Urahara comes in to help Ichigo regain his Shinigami abilities with the help of Hollowfication, which not only helped him gain his Shinigami abilities back, with a manifestation of his Hollow side, but also awaken something that was asleep within him?
Something Ancient awoke within him....
Ichigo's first encounter with Juha Bach/Zangetsu no ossan was to solidify his soul to greater heights, and to also work as a medium of him other abilities to balance them all in a trinity. Bascially Juha Bach being a quincy withing Ichigo's soul meant that he was there for a purpose! And that was to protect Ichigo and train Ichigo, but also to be his guide and make him stronger.
Juha/Zan knew something very important....something that happened in the past that was sure to happen in the future, and made it his goal to not allow that to happen, so by manifesting himself into Ichigo, and giving him his power, and to aid his other powers to work perfectly in harmony with his Hollow power, to which he knew how to do so, since he's been with Ichigo throughout his childhood, meant that his worked with his latent hollow abilities at a very young age, and merged with them.
Juha Bach isn't as evil as people believe him to be, since all he's been doing until now was protecting Ichigo, like the final battle he fought to gain the Final Getsuga Tenshou, he said that he only wanted to protect Ichigo....
Protect him from what?
He calls Ichigo his Son, just like his other Quincy children...he's their creator after all.
Te Sword that Ichigo pulled out was his...Yes that was his blade, but used that to manifest the Shinigami abilities and work through his sword, and to add on top of that he also allowed Ichigo to access his Hollow abilities through them too.
Like that time he switched between him Zengetsu/Juha/Black/Quincy/Hollow and Zangetsu/White/Shinigami/Hollow to fight Ichigo and to test his power and to nurture him, and to make him stronger, albeit some intimidation from White"Shiro"?
The sword was Juha's Yes but there's a reason why he used his sword...and that was to make sure that even if the Quincies did rebel in the near future that they can't steal Ichigo's power, and to protect his power, and to protect him.
I have so much more to say but my brain is expanding too much and I don't want to start breaking windows with my mind so let me cool of a bit so I can think of how to finish this without damaging my cerebral cortex
