There are a couple of implications of that story.
1. The Dharma is not easy to understand.
2. At that time only Siddhartha understood it.
3. The great Brahma implored the Buddha to teach, acknowledging him as superior and as a buddha.
From a Mahayana perspective the whole thing was a show, a skilful means only, as the Buddha was enlightened aeons ago. That is another way of saying that one should not get lost in verbal details but see the purpose of a story.
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)