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I just finished re-watching Bleach hence many things that never made sense started to make sense now

- Orihime and Chad were influenced by Ichigo's reitsu but it was hogyoku which granted them their power. Both of them desired powers to help Ichigo.

- Hogyoku is a blue orb like thing which is grants powers to those who comes in contact with it.

- Urahara and Aizen both developed Hogyoku but they were unaware of each other development until Aizen used his Hogyoku on Visored(former shinigamis). Aizen's Hogyoku was incomplete which only converts shinigami into hollow. Later he merged both versions of Hogyoku which you saw during Arrancar Saga (when he was creating Arrancars it was shown that Hogyoku had kinda two layers.

http://bleach.wikia.com/wiki/H%C5%8Dgyoku

I know what you mean. From Aizens explanation I guess they somehow did get it from the Hogyoku (the ball thing) I mean he said it happened because the will of the Hogyoku. All I do know is that I hope someone slaps some sense into the prick :) Sorry my explanation isnt much help

Ichigo will beat Aizen. Ichigo will lose all his powers in the course of this battle... And it gained`t come back... For the period of this arc. Then the arc will close and open up into a new one. I don`t know the place you heard it however right now, in the manga, a brand new arc is just constructing... So I doubt bleach is gonna finish with simply "two extra seasons".

basically the hoaku grants the deepest desire of every who's around it.....so basically chad and odohemi wanted to help itchigo which gave them their powers........the vizards were the side effect of aizen's experiment to turn soul reapers into strong hollows......they do learn how to control their new powers.