Random ideas topic
Yoruichi is hot and all, but Isshin is just so much cooler than her. I'd much rather he train Ichigo than her.
Plus Stray Cat Strut was that Fosfor/someone team up right? I read a bit of it, and it felt really, really forced. And Ichigo felt really OOC. The crossover wasn't my cup of tea either.
I'm not bagging on them, but I think that it could've been executed much better overall. Though, co-writing stuff is quite a challenge, so I think it could've been a lot more rough around the edges.
Anyways, it's an entirely plausible scenario. Ichigo saw a hollow when he was nine, and IIRC, Ishida explained why he didn't see them till later. Something about having so much spiritual power that when he first touched it, instinctively, he shut himself off from it because of the shock. The shock of his mother's death could've done it too. And Rukia mentions that his spiritual pressure was set on the lowest possible emission, which is why he wasn't attacked before, but that girl ghost made him tap into his spiritual power.
I think that's what happened, but it's been a while since I've read the manga. If I get a chance, I'll look that part up.