I disagree as well. I basically agree with
@Arc7Kuroi and
@Specterxxxx conclusion.
I'll make a long post since I'll not be able to answer soon to this thread anymore, feel free to read.
The reason lies in how Reiryoku and Reiatsu function in relation to a Shinigami's stats. As explained in Unmasked, the level of Reiatsu is directly linked to someone speed, reaction time, attack, and defense, all of which are link and increase as Reiatsu increases.
For example,
Tōshirō was able to react to and stop the momentum of the strongest Gerard throwing his shield like a weapon. This is significant because
Gerard's strikes were able to land an hit and were strong enough to make Shikai Zaraki bleed. Tōshirō, on the other hand, was able to react to an even stronger Gerard’s attack and block his momentum as well. Later,
Gerard explicitly tried to crush him, yet it wasn’t enough to wound or bleed Tōshirō, whereas a way weaker Gerard had previously damaged Zaraki causing him bleeding as
@Specterxxxx pointed out.
I would add that
Gerard wanted to crush Zaraki as well, same words,
Gerard thoughts to use both the Hoffungs and even a Quincy bow that is deemed to be a new torrent of power to crush him, beyond mortals (far more than what he tried against a Zaraki that even if underestimated, he still thought to be > Shikai Zaraki)
To give context: against the Visoreds, Renji, Byakuya, Rukia, kid Tōshirō, etc., Gerard never unleashed the Hoffnung.
He only did so to fight Shikai Zaraki. The Hoffnung was still massively superior to Zaraki’s Shikai, since even a full-blown attack could only scratch it. Gerard later claimed that,
despite feeling an increase in spiritual pressure from Zaraki’s Shikai, he still
wasn’t worth using the Hoffnung against. However, Gerard underestimated him, true, Bankai Zaraki proved to be worthy, but what Gerard thought to be an increase from it's shikai self, wasn't.
This shows that Shikai Zaraki represents the bare minimum level for the Hoffnung to be used.
Now, a much,
much stronger Gerard, however, stated that Tōshirō himself might be more worthy compared to before, and after seeing his shield get negated, he actually decided to use the Hoffnung, which implies that Tōshirō was already a threat worthy of it even before showing any nullification abilities.
Later, Gerard even tried to use his energy bow, releasing a new torrent of power to crush him, and that was still more than anything Gerard tried against Shikai zaraki.
And yes, keep in mind that this Gerard is massively stronger than the one that Bankai Zaraki bullied. That same Bankai Zaraki wouldn't be able to do the same against this version of Gerard.
Now, given this, Why didn't Gerard just use his punches if that was enough? He is even much stronger than when he was punching and bleeding Shikai Zaraki.
I get there's no clear statements or feat shown, but we can also use logic and narrative to try to find a better rating than Unknwon:
If Toshirō doesn't scale to Gerard in speed and strength, would be very easy for Gerard to hit him as he did with Zaraki and one shot but:
- Gerard tried to kill him with the shield, failed. -Striking strenght, useless.
- Tried to use the Hoffung which is only for worthy opponents -Failed (debated to be AP/Hax, but Gerard didn't know, he is simply going by the SP he feel)
- Then he did pull up the Quincy Bow, new torrent of power to crush him, that never thought to use against Zaraki -Still was not enough, (tho he thought it was needed to kill Toshiro)
- Tried to grab him and crush to death -Toshiro wasn't actually scared, neither bleed, and didn't turn into a meat ball.
End result, the strongest version of Gerard counld't reliable kill or damage or bleed Toshiro.
Additionally, Zanpakutō powers are directly related to the user’s spiritual pressure. While it's difficult to quantify a 1:1 comparison, it can't be ignored that Tōshirō managed to affect and bypass Hoffnung, and even froze and shattered the energy-based bow Gerard created. While it's true that Tōshirō's Zanpakutō has nullification abilities, Tokinada has clearly stated that a Zanpakutō’s effects and capabilities are intrinsically tied to the spiritual pressure of its wielder.
Taking into account the Gerard, Toshiro fought was even adapted to the strength and speed of Bankai Zaraki, I think it's more than fair back-scaling him to value of Shikai Zaraki rather than going by an Unknown rating.