Yeah as you can see there's no real good answer for this lol, "getting in" with nightwing is a major reason I believe he shouldn't be in the S tier, with characters like killer frost who can slide into full combo lol, batman with a broken jump 2 and aquaman with a broken reach on every attack, nightwing falls short of a good get in tactic
Check my channel out for combo videos ranked matches montages and more
http://www.youtube.com/user/TequilaMockingburd
And no I don't type my signature out everytime, im using Tapatalk app lol