@kusabireika
Well, I think that Sirzechs 'true form' is something that is unique to him alone ... which is the reason why he is considered as a Super Devil.
Although I agree that it's possible that Vali will gain some transformation / power up from his Lucifer origins, which haven't got a lot of focus in LN so far.
After all ... it's IMHO the only thing that can make Vali more or less keep up with the power ups that Ise has been getting in the last few volumes.
Still, I wouldn't give too much details about what this power up might be, since the possibilities are pretty much ... endless.
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