I'm sure Oliver will be able to find dragon eggs, then what difference does it make Deinerys if I have dragons or not. But he can use Targaryen blood as a significant claim to the throne, and even if Dany gets to him as a virgin, and not a woman, reputation is important after all.
It's not enough. And the hero can't do it with Deinerys on his own, thereby he will get both dragons and a faithful wife, who will not have to be programmed anew, and having fun in the body of the grandson of the "mad king" looks like a good idea.
