(franzoir @ Mar 17 2013, 01:07 AM) Isshin staves off the hollow but is wounded. Masaki saves him. Isshin stays in the real world to heal. Isshin and Masaki grow closer. They make love. Masaki is pregnant and in her womb is the first shinigami/quincy hybrid. The hollow comes back and attacks Masaki. Isshin uses Final Engetsu to kill the hollow. Because Masaki survives the attack the hollow powers transfer to Ichigo making him part fullbringer. Unlike most fullbringers because Ichigo is part shingami as well, the hollow powers merge with his innate shinigami powers and becomes apart of zangetsu. This means his hollow also manifests as another person like zangetsu. The only other people to experience this phenomena are the vizards and Ginjou who IS exactly the same as Ichigo minus the quincy powers.
Somewhere inbetween that timeline Isshin meets Urahara. Urahara gives Isshin a gigai and tells Isshin that his newborn son will start to likely show symptoms of hollowfication as soon as his shinigami powers awaken.
Just got up to speed again with this manga, and i agree with your prediction. Just with a few minor details being a little different.
As far as i noticed Ichigo isnt a Shinigami/Quincy hybrid. His mother at this point is a Quincy/Hollow hybrid. And they are turning Isshin into a Shinigami/Human hybrid to stabilize the hollowfication procces. Because they need the complete opposite of Masaki to do that or else she will die. So in other words, ichigo is a Quincy/Hollow/Shinigami/Human hybrid.
Also which hollow comes back? If you are talking about whitey then he wont, because he accually imploded on himself after he transferd his condition/virus onto Masaki (kinda like a vampire). So if there is gonna be suck a attack, then it probably will be a new one. As for the part of the process for ichigo to get Fullbringer powers. I think he already has what he needs in his lovely dna cocktail. Because it was never stated that the mother needs to be pregnant at the time of the attack. Just needs to survive a hollow attack and transfer the traces of the hollow onto the newborn child. And Masaki pretty much already has done the part of surviving the attack. And instead of the normal traces needed, ichigo got the special bonus of his mother being part hollow.
As for the reason why Isshin will use the final attack of Engetsu i can only speculate one of two things. Either it is indeed a hollow attack, one who has around the same power as whitey if not stronger coming for him and Masaki. Or Soul Society idiots found out what isshin has done and send somebody after him like they always do with rule breakers. In the process of him almost being captured, he will use his final form to defend himself and Masaki. Losing his shinigami powers in the process and Soul Society bans him to a human life. My speculation on both are alot bigger, but you catch my drift. Dont feel like typing alot of pages here XD
As for the part of Ichigo's powers. I have my own idea's on that. But wont deny yours. All is possible at this point. Mine just simply state they havent merged at the beginning, he just has them all without knowing it. He just never knew it himself. A few points on why i think this:
At the beginning he subconsciously removes rukia's binding spell to save his sister. His inner shinigami powers reacted to the binding spell, so this was already the first step off his shinigami powers awakening even before rukia transferd hers into him. As for the part of him seeing souls is just more part of his shinigami/quincy/hollow eyes then him needing to awaken it.
His hollow powers is pretty obvious as you also know. Because of what happend in the pit under Urahara's place. At the point they broke his chain his inner hollow toke the uperhand because he saw a opening to get to the surface. He got subdued in the end, but at this point he is already awakened and slowly gaining strength. And even protecting ichigo a few times in the process during that process.
As for the part of his Fullbring power. Because of what happened with his hollow powers getting merged with his shinigami powers after the whole Ulquirra battle. Where Ichigo is pretty much afraid of this own hollow powers. His inner shinigami and hollow souls decided that ichigo should learn the truth and they make clear that both are his powers. And they merge thus beginning the battle between them so he could learn the final getsuga tensho. After using that his shinigami/hollow powers pretty much got put back to being dormant, but still being there. This giving the opportunity for ginjo to find him and start training to revive the hollow part of his sleeping powers. Done so in a way that the hollowfication part still stays asleep.
I do see your points, but this is just my own way of thinking