However, just as said before, all ten opponents are random, unless one has exceptional luck and all ten happen to be weaker opponents.
But the likelihood of that is small; anyone who has made it this far would not have terrible luck. It is impossible for someone to have luck so good that it's like they're cheating, encountering only weaker opponents ten times in a row. Therefore, it is inevitable to face opponents stronger than oneself.
So, luck can only help you encounter weaker opponents as much as possible, but it can't prevent you from facing those stronger than you. This is when absolute strength is required.
The best scenario is to have strong abilities combined with good fortune; it's impossible to pass purely on luck.
Zhuo Jing belonged to those with exceptional luck, though not quite the super Europe Emperor, destined by fate. Still, the strongest opponent she had faced so far was at Rank 7, and she had not yet encountered a Rank 8.