Alright so, serious response.
Disagree with the CRT. First, it's important to mention that, obviously,
confidence doesn't necessarily translate to
ability. Shaka being confident he can take Shun-Hades down, and Shaka
actually taking Shun-Hades down are two different things. Likewise, Shun-Hades' reaction doesn't prove anything. He could've been suprised a Gold Saint took initiative against him at all. None of these are actual concrete arguments for Shaka actually scaling.
But how feasible is it for Shaka to acatually scale? Let's find out.
One of the latest approved changes to the verse on the wiki was the acceptance of Unshakeable's canonicity blog, found in
this thread. This blog argues that, in addition of a shared multiverse, the gods of Saint Seiya exist independent of timelines, and no alternate versions of their real selves exist in the multiverse. The exception being, of course, human hosts, which
do have alternate selves. Why is this important? Because the Shun-Hades of Lost World, an alternate timeline seen in G Assassin, utterly
demolished the Lost World God Cloth Saints:
And because there's only 1 real Hades, it means this is the same Hades that stood before Shaka in Classic. So, in order to scale him to Hades, we would have to scale Shaka above
God Cloths. And we know 8th Sense users are
inferior to God Cloths, this is something that you can infer pretty easily in Classic, and is flat out stated in a Shion Q&A:
The following is a translation of this scan done by Libra Jay, the translator responsible for the newer, quality English translations for Episode G.
"Q) 星矢たちの聖衣はアテナの血によって神聖衣へと進化を遂げましたが、
Q) The Cloths of Seiya and his friends evolved into God Cloths through Athena's blood.
白銀聖衣と黄金聖衣が神聖衣へと進化を遂げた事は過去にあったのでしょうか?
Have Silver and Gold Cloths ever evolved into God Cloths in the past?
また、鱗衣と冥衣も同様にポセイドン、ハーデスの血で進化するのでしょうか?
Do Scales and Surplices evolve likewise with Poseidon's and Hades's blood?
A) 理屈だけならば、アテナの血を受けることができれば白銀聖衣であろうと黄金聖衣であろうと神聖衣へと進化しても不思議はないじゃろう。
A) In theory, if either Silver or Gold Cloths received Athena's blood, it would not be surprising for them to evolve into God Cloths.
但し、聖衣がいくら進化してもそれを使いこなす聖闘士の小宇宙が高まりが伴わなければ、真の力を発揮することができないのじゃ。
However, no matter how much the Cloth evolves, it's only if the Saint raises their cosmo accordingly that its true power is revealed.
星矢たちが神聖衣を使うことができたのは、阿頼耶識をも超える次元にまで小宇宙を高めることができたからだということを忘れてはならんぞ。
Don't forget that Seiya and the others were only able to use their God Cloths because they raised their cosmo to a level beyond even the Arayashiki.
また、鱗衣、冥衣についても同様じゃ。
The same applies to Scales and Surplices."
Direct confirmation that God Cloths > 8th Sense.
TL;DR: It's not feasible for Shaka to scale to a full power Hades, even in a host body, at all. At least not at full power, but then Shaka wouldn't scale to his 2-C rating anyways.