I don't get why you say that because they're all pretty different reasons for the attack not working out.
I don't think 3 will happen. 2 might, but I'm not hopeful. Meanwhile I can't see why 1 wouldn't happen. Perhaps Gon could convince Meleoron that Knuckle is the better person, or that they somehow get discovered before they move in for the attack, but I do think that the attack would be attempted to some degree. Gon wouldn't just go "nah, we don't do sneak punches".
That's my reasoning. I'm just as baffled by your "It's not that kind of series" answer as I was with the prior post.