I don't know why Ikkaku is so worried to show his Bankai around anyone. Renji has Bankai and everyone in the Gotei 13 are aware of this. Renji also wasn't promoted to Captain level so why should Ikkaku. I hope in the Zanpaktou Unknown  Tales Arc Hozukimaru will show everyone that Ikkaku has attained Bankai and he wouldn't  have to be cautious anymore. 

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