You may (or may not) have noticed that I'm trying to get away from saying that "nobody else makes that play" and it's because you're right. The only way anyone could say that would be if we could exactly duplicate the same play for two players - they both start in exactly the same place, leaning the same way, they both have the corner outfielders in their same spots (so there is no communication problems between them) etc.
Actually saying "nobody" is fairly ridiculous because it makes what one player does into an exclusive property, saying that nobody else in the world can do it. There are hundreds of minor league players in the US and it's not outside the realm of possibility that ONE of them has the defensive skills to play like JBJ, Kiermier, or your current man-crush of Laureano - but can't hit a lick. And that doesn't even begin to talk about the players in Japan or the Dominican Republic.
What I will say is that I see JBJ making plays that I believe many/most OF'ers don't make, Mullins not getting to the ball in Fenway being a prime example. Now, can I PROVE that JBJ would have made that play that Mullins didn't make and probably cost the O's the game? Nope, just as nobody else can prove that he wouldn't have, because, again, to PROVE it we'd have to be able to duplicate the play for JBJ.
Edit: However, I do reserve the right to use hypebole in my exuberance from time to time and say, "Wow, NOBODY makes that play!!", knowing full well that somebody, someplace might be able to replicate it.