Explain "every advantage over aquaman"
Sorry, that was a bit of hyperbole. I'm sure I'll accidentally leave shit out but here we go.
Here's what I actually think: Nightwing in staff out reaches Aquaman. He's very safe, and has a lot of +frame attacks. In other words, he's tough to punish and Aquaman is forced to risk a backdash or lose a bar to push block. Aquaman might as well not even attempt to zone Staffwing. Staffwing's J1 stuffs Aquaman's D2. Trait isnt extremely usefull against him either.
Above all, with life lead Nightwing can turtle the shit out of Aquaman. Fuck, even if Aquaman has life lead he cant stay back, he's forced to go into the meat grinder to win.
So if Aquaman has trouble from a distance, and trouble up close, doesnt that equal bad matchup? There's a big guessing game against Nightwing and sometimes it's just the right reads that win the match, but all in all I think Nightwing vs Aquaman is a 4-6.
I've watched all the streams, and all the big tournaments and I'm still yet to see a Nightwing as good as the people I play on PSN. I understand that sounds ridiculous, but it's true.
Commence ridicule! :-P