I think Kurapika and Leorio meant nothing to Killua. He didn't even remember Leorio's name. They were just "Gon's friends" to him.
I agree about the last point thought.
In the 99 version and the manga he kept saying "I want to see my friends" not just "I want to see Gon" even if he didn't remember their names he still had a bond with them that make a lot of other scenes make more sense. (There's no "I don't know about them but I'm making sure you and me get out of here" by Killua during the trick tower in the original) and because of that it also makes sense that Leorio would even think Killua was trying to help him during his fight but if he didn't care about him at all that wouldn't even be a debate. One of the greatest things about HxH is the bonds between the main cast and for it to have taken longer and basically bonded in fire in the 2011 version takes a bit of that away.
Thanks for agreeing on the second part though.