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Bad Fenton parents reveal but instead of the usual Trope of going to Gotham he goes to Bludhaven just a few months before Nightwings first appearance.
Danny accidentally stumbles into information breaking mostly because he's Gathering all of his information himself by accidentally stumbling into back alley deals, he is not supposed to find and then turning intangible so he doesn't get shot at.
Danny isn't really Nightwings priority when he first gets there and he definitely uses his services as he's cut off from his main source of information.
The two of them end up having a very good relationship as the two of them are bouncing quips off of one another by their second meeting. Danny brings out the side that is mostly tucked away at the time from Nightwing as he is still in his angsty just left home phase.
Nightwing doesn't tell the bat family about Danny originally because he is estranged but eventually it becomes Danny being only his team. Gotham has all of the bat family and Nightwing has Danny. It will take years before anyone meets Danny.