Sora was thinking the same, from what Gyaku had said the energy will nurture their souls and bodies and continued to do so while they were sealed...
When Sora freed them they had noticed the change in the quality of their spiritual pressure and their own power but none had expressed or said something about their own body...
He tried to find what was happening to Yoruichi with Gyaku but even he wasn't sure...
Gyaku: "If we go by this world standard, then her reiatsu got refined and more potent than before but due to her perfect control over it she may have not realised it..."
Gyaku: "By unsealing her, she gained remnants of sealed energy in her body... Originally that was meant to nourish her soul and her spirit but since they split it started refining her body..."
Gyaku: "I can't explain it otherwise..."
Sora: "If that's the case, then the others will experience something similar since they had split from their spirits..."
Gyaku: "You mean Urahara and Isshin... As for Ichigo and Nelliel or even Masaki, i have no idea how they will take the sealed energy if they have any..."
As they were talking they saw Yoruichi getting up and all three they could see that she didn't have even the slightest of scratches...
Yoruichi: "Um... Sora??? Care to explain here??"
Sora sighed and proceeded in telling them what his theory was shocking the two greatly and made Byakko groan in frustration that she missed such a rare chance...
Although from before she got sealed and after whatever benefits Yoruichi gained she did as well, but she didn't know she still had leftovers of energy and since they split it helped Yoruichi refined her body...
She growled in frustration the more she thought of it as if this continued she will lose and be forced inside her inner realm never to be called again...
Therefore right here and there her eyes flickered with lightning and her fur stood up as she raised her hands causing the lightning from her eyes to travel through her body into the palm of her hands as she spoke out...
Byakko: "Punish Everything With Your Rumble!!! - Raiun Tentai Byakuko!!!"
Her fur started expanding as her sword was formed in her palms and then breaking in particles as it fused with her fur transforming it into a cloud-like substance that glues on her body...
Sora was shocked by this sight, it looked really lame but at the same time, it was like a goddess descending the clouds of heaven...
He tried to imagine Yoruichi with her tanned skin appearing like that and almost got a nose bleed which was terribly rare for him to act like that...
He tried to push all thought in the corner of his head and as he did he realised something, that when Yoruichi activates her Shikai her Shinigami Attire which is black is covered in white clouds in a similar way...
The only difference is that on Byakko's form now is like as if she is naked covered by steam.....
He could tell that this form isn't suited, for assassinations as she was formerly captain... But even he felt danger from that...
He didn't know why but he started shivering as if those clouds represented the heavens themselves...
Nevertheless, he ignored his feelings and glued his eyes to see what kind of powers her Shikai have...
Yoruichi's face looked grave when she saw Byakko releasing her Shikai, her desired were always to be the fastest and gained a title that matches those of the gods since she was a little kid...
She was hoping when she awakened her Zanpakuto that she would get something that will make her soar through and have her own freedom with nothing to worry about...
Only to be disappointed greatly...