After last night win, I would say its not luck at all. They kept going back at the Warriors not letting them cut their lead too much. They are mentally strong. If the points distribution they had last night continues, they have a good chance. You want your leader to lead in scoring, its more sustainable. And KL finally found some rhythm in his game, mostly in the forth qtr.
That said if both teams have all their guys and play their best basketball, the Warriors are a better team.
Its a great series and I suspect Kerr will have KD in the mix soon.