It's brought to our attention this chapter when Zoro used Enma to defend.
I don't think this is that special. It's merely the sword Zoro countered/blocked Kaido's attack with.
- Was Wado/Sandai under special focus when Zoro used it to cut Big Mom's Heavenly Fire.
- Would Wado/Sandai be under focus when Zoro uses it to cut Kaido's Boro Breath?
This isn't noteworthy, it's simply that activities Zoro performs using Enma are specially reported on, but the activities he performs using his other swords aren't.
It's brought to our attention this chapter after Zoro attacks Kaido.
Yep, Zoro struck Kaido using Enma for the technique, and the attack triggered Kaido's Oden PTSD.
I maintain my stance that Enma is not treated as any other blade/mere training tool
Not really. The focus Enma has received so far is not materially different from the focus Shusui received in the Oars fight (in fact, Shusui has been even more highlighted).
We have 5 pages of Zoro ruminating on Shusui during his Oars fight.
Enma would continue to receive special focus from Kaido in particular, because it's one of only two swords that gave him his lone grievous scar, so seeing it hurt him triggers his PTSD. However, Zoro hasn't given Enma more attention than he gave Shusui vs Oars (he commented on Enma in only one panel, vs the 5 pages he spent ruminating on Shusui in the Oars fight). This is without even bringing up the attention Zoro devoted to Shusui during and immediately after the Ryuma fight.
The attention Shusui received from Zoro has been far more than what Enma has received so far, you're just suffering from recency bias. Enma may yet receive more attention from Zoro than Shusui did by the time the fight ends, but until then, I wouldn't consider it as especially different. You can trust that I'll be honest in my evaluation of this.
(I'm ignoring the Kaido attention because Kaido has history with Enma while Oars did not have history with Shusui. Despite that, Oars commented that the first Shusui attack would have hurt him pretty badly).
As for whether Enma is a power up, I've said that I think it is already.