maybe his uncle

i still think ichis dad was one of the royal guards "squad 0" and is mom is a princess of the royal family and they fell in love and the king was all mad his daughter is making sexytime to a mere soldier so they ran off and turned off there reitsu some how and lived a normal life! then ichi mom died and isshin decided to turn his reitsu back on but it took some time for it to recover

I think its been said that he lost his powers for a long time since Ishida's dad was like "oh u got ur powers back" and not "oh u turned them back on"

at this point
i dont think anyone can lose their powers

go go go wtfhax ! asn ded

eh it could be taken in any direction and when i said turn off i ment he did some kido or used some faux body to seal it away and it took many years for it to come back

it doesnt matter
ichigos gonna gain another lvl of super saiyan
and then aizen will lose in 1 hit
then manga ends

Probably someone in Squad 0 exiled him and sealed his power for a hundred years.

manga wont end, theres probably gunna be some random in the background pulling all teh strings n they didnt introduce him yet, or maybe its urahara... hes pretty shady

but aizen will probly die in 1 hit... lol

its gonna be like
ichigo new form fights aizen evenly
aizen brings out a newer form and beats ichigo like nothing
on the brink of death ichigo triggers a newer form and kills aizen 1 hit

its pretty much liek this in EVERY single boss fight with ichigo
EVERY