Here's the difference between what you are saying and what Kurou is saying:
You are saying that Stands are City Block level because of Star Platinum... except we know that other Stands match Star Platinum or surpass it in speed and strength. We also see even weaker Stands like Golden Experience can effortlessly knock away cars to the point they even explode from it's punch.
Kurou, meanwhile, is saying that Saitama and Cosmic Horror Garou stack to Multi-Star/Star System based on the fact that Saitama was at the height of his anger and Garou copied that and they both clashed.
This is like giving Naruto and Sasuke their clashing feat at their final battle for just themselves with nothing else showing their individual power matches that.
THAT'S what I'm asking Kurou right now and I have been this whole time. If he's trying to argue that their clash should give them that, then okay, I am still iffy on the "Hole of Stars" as it's not even given rarely a mention and nothing even fits that's what happened based on a best guess(that no one is even using anymore, I don't even see SB bringing it up now) but there's NOTHING showing that Saitama or Garou individually match up to that and to say that's the case based on no evidence is asinine to the max.
By this logic, we should give Yhwach Multiversal because we have no idea of Bleach's 3 Worlds are connected to the Universe, their own or what.