The manga stated DS would need the power of the big bang to escape the reality he was trapped in. DS broke out later, and tanked the same amount of blasting power that is equal to the big bang. He was already universal at that point.
Wasn't it Satan (in his true body) the one that broke out of the Abyss? I don't recall D.S. breaking out of it, rather I recall him leaving the Abyss by entering Hell through a portal - and that was facilitated by Satan himself.
And no, he just tanked something with the power to destroy a galactic center.