User blog comment:BROTHER BAN-KAI/514. Born in the Darkness/@comment-5147109-20121030174137

Here's my theory:

Isshin is Shinigami, Masaki was Quincy, Masaki likely may have been attacked by a hollow when pregnant with Ichigo and could have fought it off, which would explain his Fullbring abilities. So with Shinigami, Quincy, Fullbring and through the Shattered Shaft training, Hollow powers that could easily explain his heritage, now Masaki could have been the daughter of Juhabach which could explain a relationship between the two and explain how his "Reiatsu Memory" could have called forth advanced Quincy techniques like Blut Vene, so at this point if Ichigo was to regain access to his Hollow abilities and fired off a Blut Artere, Hollow Mask, Bankai enhanced Getsuga Tenshou he could probably do some serious damage even to Juhabach. But anyway back on topic, at this point I think Ichigo needs to heal and get some training from Uryu on how to use these new powers and learn how to combine them with his Shinigami powers, but on top of that I think it's time for him to speak with Zangetsu again, I'm reminded of what Tensa Zangetsu said to Ichigo while he was in the Dangai training, he said "I gave you Getsuga Tensho to protect." Now maybe it's just me but it seems like there is a bunch of other techniques that he has left to teach him since pretty much all the other Soul Reapers Zanpakutos have multiple abilities at their disposal especially while in Bankai. Up to this point Ichigo has been on a learn as you go training regiment which is good because it makes him unpredictable to the enemy but he's at the point now where running on pure instinct and luck won't save him, he needs to master his abilities to go toe to toe with the likes of Juhabach, not to mention the fact that Juha still has Zanka No Tachi which Ichigo would get snuffed out before he even blinked if that was used on him.