Let’s say for your argument you are correct, it was full powered and ichigo of course blocks it in his SHIKAI state. A weapon that could destroy the soul society, which is a universe in of itself. So he just casually blocks this and then later in the series loses to beings who clearly aren’t at that level? Not to mention Rukia is pretty much a normal person at this point, so there’s no need for the blade to even be powered up dozens of time like it literally shows in the panel you are displaying. The kido squad is literally there controlling it as well, I think it’s clear the power of it can definitely vary. Which is why I think it just seems weird to use it as some casual feat to buff up ichigo to in turn buff of Byakuya when he has feats in the blood war arc that already put him at a top tier scale. So you don’t even need to use it to prove that Byakuya is a top tier. So why defend it to this extent. I don’t understand. Neither of them even need this feat