I mean, it's kinda understandable. There has to be some reason why Yichen is an anomaly among all other powerhouses. I think Yichen even says that Ruo wouldnt be able to surpass him without the Dragon Souls?
During the expedition, Xiwen states Ruo can fight stronger LH as a MH without mentioning his dragon powers. But Ruo says he can match Xiwen with everything he has including his dragon transformation. MC says they can fight stronger LHs as MH, similar to Ruo without dragon transformation. So I'll take this as the only evidence that these respective versions of Ruo and MC will have similar potential. Maybe MC cannot quite catch up to Ruo due to fact Ruo's has been using steroids compared to MC's protein powder.
So I kinda see it like this. IE MC with GS=<Ruo with Sword Dao=Yichen. Maybe I'm being too generous but this makes most sense to me. Dragon souls make the biggest difference for Ruo but he will deadlock towards the stronger end of CF while we have no limits due to our cultivation body and physique.