Due to the fact that our crit levels get increasingly higher, the amount of RNG we need to parse well decreases. At the very top rankings, 1-20, you can be almost sure to see basically the same people over and over again, and the reasons are simple. The top geared warriors are generally also very good players, meaning they can perform at the highest possible level, while also having the gear to take away most of the pure RNG from our rotation.
With that said, if you look at the top parses for most fights this tier, you'll see the Padders rather then the good players topping the charts, for warriors at least. The same can't always be said for other classes.