I hope you realize that Marvel has The One Above All, an omnipotent. You know, those entities that have absolute unlimited power and can do anything they want with the omniverse? Rikudou is strong but could never be an omnipotent. Omnipotent essentially means that they could not possibly lose in the first place. Even without The One Above All there are characters like Galactus, who regularly devour planets and could destroy the universe at full power.
DC also has characters like that. As I recall, Pre Crisis Superman actually destroyed a solar system by sneezing, and Superman is far from the top of the chain there.
Pretty much everybody who matters in DBZ can destroy planets. Rikudou is hyped to be strong, but his hype has never suggested that he is on that level of strength, and even then the gap in speed between DB and Naruto is immense, Rikudou is most likely far slower than the top tier DBZ characters.