Talent obviously exists for osu!, I think if anyone tries hard enough with the right mindset and intelligence, they could be very proficient at, say, an HD+HR modset, but for high tier DT, you need some sort of talent or capability for speed. Not everyone is capable of accurately streaming 270bpm deathstreams like Gayz, our bodies are built differently. Also, time is a factor, because even with the combination of hard work and time, by the time you reach the meta level today, it's gonna be completely below what it would be 2 years from now, and talent can greatly accelerate the process.
The problem with Railey2's thread though is that there's no accurate way of measuring your capability. When I think of talent, I don't think of someone that's a "natural", because other games you've played before osu! can heavily influence that, which is what Railey2's thread is focusing on. Only you can determine whether or not you can become a pro, not someone else.