The news of Leon defeating the Ocean Goddess will undoubtedly spread like a storm throughout the multiverse. However, the multiverse is vast, especially when it comes to spreading to the ears of those typically reclusive dragons—it could take decades or even over a hundred years.
True things can't be falsified, and false things can't become true. Pretending to be a Ruby Dragon, only to be exposed, will surely result in a miserable outcome, hardly worth the risks. Besides, Leon has a bit of a psychological aversion to pretending to be others, but he doesn't mind using the fame of the illustrious Gem Dragon God Sadivo to promote himself.
Thinking of this, Leon nodded with satisfaction and smiled at the Ancient Jade Dragon.