Ichigo can't use Bankai or his HoS form. Fight takes place in the Sokyoku Hill. How would it go?
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Typical EoS Shikai Ichigo downplay, nothing to see here.
Just refusing to acknowledge that we have a visual fucking indicator to prove that he never went all out (not even close) before the fight with Mustache (ie visible reiatsu vs non-visible reiatsu), or that Byakuya has nothing on the direct hype from Mustache that Ichigo's sheer reiatsu covers any openings he might have otherwise had.
Yes a Mustache who DID NOT have The Almighty active and whom has thus never seen Ichigo's new Bankai, is totally taking that into account with his statements.
Let's just ignore that it was only when Ichigo hit him with the Gran Ray Cero and Mustache turned The Almighty on that he fully understood how much of a threat Ichigo was at that point. So NONE of his earlier statements are in reference to his stronger forms.