I DON'T OWN BLEACH .THOUGH I WISH I DID.
This is just a one-shot though with enough votes I MAY turn it into a SEPARATE full fledged story based on this. If you want to write it however then just tell me so I can read your fic. Tell me in the review. Vote in the review.
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This is to clear all doubts.
Many have said that it cannot be done if you stick to the manga but I say it can be done. If you want to know how plz read all of the below.
Arrancar are hollows that have had their masks almost completely removed and have gained the powers of a shinigami. But they remain more hollow then shinigami. So no shikai and bankai and in the process, they gain a human appearance and strength, speed and intelligence beyond the level of a simple hollow as well as hierro, skin so hard they can fight against opponents with swords bare-handed.
Like Soul Reapers, arrancar possess zanpakutō. Unlike Soul Reapers, whose zanpakutō are manifestations of their owner's soul, arrancar's zanpakutō are manifestations of their former hollow selves. With occasional exceptions, an arrancar's zanpakutō resembles a regular sword in its sealed state. When released through a process called resurrección, part of their original hollow form is restored, changing their appearance, giving them greater strength, and granting them access to ALL of their original abilities.
Ichigo has an inner hollow, his shinigami side is in control. So he cannot be an Arrancar but his hollow could go through all the stages. Plus his hollow is at least Adjuchas (It used cero during hollow training with the visoreds) or maybe even a Vasto lorde (it was very humanoid). Also Rukia's powers created another set of soul sleep and soul chain in him.
Yes I know Bayakuya destroyed them but they were still in him and his hollow ability is and I quote 'high speed regeneration' so think about it. Add to that the fact that he broke his hollow mask and didn't even notice it (when he regains his shinigami powers). Finally his reiatsu is again I quote 'More like an arrancar then a visored' when he uses his mask.
There its not so farfetched now is it? I mean sure it's never been done before but plz think about it. Also some good news, I am going to write a full fic based on this and will be as realistic as possible to the original manga. So w8 for a week for the first chapter and keep checking my Id also I'll update my other fics as well. Read them as you may like them and please review.