aizen is only assuming the reason why no reiatsu is felt is because ichigo cast it off to increase strength, but last night i thought of another reason why reiatsu couldn't be felt.
everyone remember this?
lots of spirit power leaks from ichigo, so he's not using full power... at that point he was using almost no power.
now, if learning to control it means you can increase power then how about this theory...
what if reiatsu being felt is the leaking of spiritual power. call it a fail-safe if you will...
if you keep pumping water into a sealed metal container pressure builds up until the point the container would explode.
the leaking of this spiritual power could be a way to limit the pressure to stop the vessel exploding, as you use more power, more will appear to leak out however the power built up inside will be stronger due to the vast amount stored inside.
if for some reason it was created so that no energy leaked out, then his reiatsu may not be sensed, however the power inside him could build up to dangerous levels which in turn could harm the user.
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how does this fit in?
zangetsu wishes to protect something different to ichigo~
yes, ichigo wishes to protect karakura but not himself, however zangetsu would either not want ichigo to die from the pressure of the built up energy, or if ichigo loses his power because of this then zangetsu wouldn't exist until ichigo gained his powers again (like isshin)
but that doesn't explain why building up power could make him lose all his power does it?
well it's quite simple, if ichigo uses up all his power at once, he'll only have it for a short time and may completely use all his energy, taking it a long time to come back, much like isshin, or the damage caused to himself could damage his soul in a way it would be hard or long for his powers to return.
that's why i believe ichigo said he'll finish it in an instant, because he's using all his power at once, therefore only having a limitted reserve or the pressure would be too great... either theory works fine.
everyone remember this?
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lots of spirit power leaks from ichigo, so he's not using full power... at that point he was using almost no power.
now, if learning to control it means you can increase power then how about this theory...
what if reiatsu being felt is the leaking of spiritual power. call it a fail-safe if you will...
if you keep pumping water into a sealed metal container pressure builds up until the point the container would explode.
the leaking of this spiritual power could be a way to limit the pressure to stop the vessel exploding, as you use more power, more will appear to leak out however the power built up inside will be stronger due to the vast amount stored inside.
if for some reason it was created so that no energy leaked out, then his reiatsu may not be sensed, however the power inside him could build up to dangerous levels which in turn could harm the user.
~~~~~~~~~~~~~~~~~~~~~~
how does this fit in?
zangetsu wishes to protect something different to ichigo~
yes, ichigo wishes to protect karakura but not himself, however zangetsu would either not want ichigo to die from the pressure of the built up energy, or if ichigo loses his power because of this then zangetsu wouldn't exist until ichigo gained his powers again (like isshin)
but that doesn't explain why building up power could make him lose all his power does it?
well it's quite simple, if ichigo uses up all his power at once, he'll only have it for a short time and may completely use all his energy, taking it a long time to come back, much like isshin, or the damage caused to himself could damage his soul in a way it would be hard or long for his powers to return.
that's why i believe ichigo said he'll finish it in an instant, because he's using all his power at once, therefore only having a limitted reserve or the pressure would be too great... either theory works fine.