Using the Selke argument is akin to everyone thinks he is better; therefore, he is better. That line of argumentation hinges on a logical fallacy; therefore, it is a weak argument.
Yes, your one singular variable is better than all the things statisticians work on in the sports world. How stupid of them not to realize we should just worship points and the eye test.
I don't blindly believe numbers; however, statistics are our best approximation, so I like to use them to build a framework of my understanding. What that means is I would group these players, maybe by 10's. After grouping the players, I would then scout those players. Once I scout the players, I would say Kopi is better, but Staal is a super under rated player, and as a team, I can use that information to try and acquire players for under market value. For what it is worth, I recently found another GAR metric, which, combined with other two, would move Kopi above Staal. Also, the micro-data, which I have only seen a few people have access too, would say Kopi is better. Stats may make mistakes, but so do GM's using the eye test, and it happens ALL THE TIME, but using the "eye-test" is never blamed. I mean, Tom Wilson just got over 5mil. That type of horrendous error is essentially wiped out if you just use the models as a framework, like I said.
Your analogy is bad, but I agree with your argument that being an expert in a field is not a necessary condition to critique said field; however, I find it strange that you critique the list, but your only somewhat decent argument is that kopi gets more points, which would be an analytical argument, and that is exactly what i did; however, you use one single variable. I used two different models. You must really, really believe in your one variable.