The chapter already compares Luffy to Ryuma.
So it looks like EoS Luffy > Current Luffy = Ryuma > Fresh Kaido.
Your trying but if you don’t realize Luffy will always be > Zoro your lost
Well comparison is fine, luffy was also compared to Roger in chapter 1000.
I think more or less Oda here is trying to establish Ryuma and Joy Boy as two God's who rival each other in strength, even if he's been very lazy with zoro towards the end point is to establish Zoro and Luffy will he equals EoS. And also to establish Ryuma is superior to Kaido.
Basically I think Joy Boy represents peak of Luffy and Luffy is pretty much already there he needs to just master G5. I don't think he has any other development left.
Zoros peak is Ryuma and he will get there by Black Blade Mastered KoH and Mastered KoH Ashura and maybe CoO upgrade.
But both Ryuma and Joy Boy are above Luffy and so is Kaido but he's below Ryuma and Joy Boy