User blog comment:Bloody Bankai/The Plot and Characters in Bleach ( Spoilers inside, please avoid this post if you do not read the manga as well as watch the anime )/@comment-1403595-20091018210300

Hey Minato, that's a good point, because Ichigo is so bad at controlling reaitsu, any change in it, be it of a different nature like in Hueco Mundo or just less of it like in the real world, would severly reduce his capability until he was able to adapt to the change. But you're right, that is rather speculative though it does explain a bit.