I'm guessing Ishin sacrificed his shinigami powers to help Masaki and the side effect of that is that Ichigo got born. But then again Ichigo has 2 sisters so how the hell did they come to life? It's also weird that they don't have powers like Ichigo, or maybe they just haven't been awoken yet. It's still funny how Uryu and Ichigo are the same age, meaning Ryuuken must have banged that maid just before he knew Ichigo would be borned somehow. Though I can't accept the fact that a dead spirit would make love to a living being and a baby would come out of it. Soo wrong lol.
O_o I just re-read this chapter and damnnn Ryuuken looks like Ichigo and that maid looks like Uryu... hmmm prolly just my imagination.