I would like to take a slightly more positive outlook to this overall slam race. I think that both players have their weak points.
For Fed, he messed up at Wim 08 and specially AO 09. Those were two high profile losses that he should've avoided specially the latter.
Then the last chance he had to beat a relatively out of form Nadal at RG 11 with favourable conditions he messed up. Now he did recover some of that AO 09 damage by winning AO 17 but Nadal fans can always say that Ralph beat Fred at Wimbledon but Fred didn't beat Ralph at RG.
Coming to Nadal, his weak points are basically his clay skewed resume. For an ATG to rely so heavily on clay to sort of pad up your slam count and not be dominant on atleast two surfaces, mind you 6 non-clay slams is no small feat but in comparison to GOAT contenders like Borg, Laver, Sampras and ofcourse Federer, it falls short.
TBH I don't think the issue is so much with his non-clay slam numbers as much as it is with the way he plays on those surfaces that many purists if you will have a hard time accepting. He doesn't change his game in anyway to adapt to those surfaces but simply waits for a draw to open up or the surfaces to be slowed down to help him translate his game to them. He doesn't show any versatility to me that is worthy of a GOAT to put it bluntly. I also find him to be too much of a complainer and expects things to fall his way. I don't find that to be a GOAT quality.
Did I add more negatives to Nadal than Fed? LOL sorry but I tried to be a little more balanced. However the key thing that will happen is that if Nadal ends up tying or breaking Fed's slam record then because both players have these weakpoints, the GOAT title will go back to Rod Laver as he has zero weaknesses even though I personally don't think he is due to his height being below 6 feet. Statistically, Laver is hard to top.
So, I don't think Nadal can become the GOAT but he probably can invalidate Federer as the GOAT and send that title straight back to ole grandpa Rodney.
While I do appreciate your effort at actual posting and not just trolling, Roger not winning W '08, AO '09 and RG '11 are not down to him "messing up" but to Nadal beating him. You have to get over those.
As to the bolded above, you definitely show your prejudice against clay, and Nadal.
Borg won 6 on clay and 5 on grass. He never won either the AO, or the USO.
Pete won 7 on grass, 7 on HC (2 AO, 5 USO,) but none on clay.
Laver won 12...2 on clay, the rest on grass. He never won a Major on HC. Nadal's Major resume is more diverse than any of those, and more ample.
The notion that Nadal doesn't change his game per surface is laughable, or even the notion that he hasn't changed his game across the 17 years of his career. If he were simply "waiting for the draw to open up" I'm fairly certain he wouldn't have won 17 majors. And waiting for the surfaces to slow isn't really a thing. Most of that happened before he was a factor.
Too much of a complainer? You seem to forget how long Roger completely hated Hawkeye and disagreed with it. Or how he has more than occasionally been ungracious when he's lost, esp. at important tournaments. He's also done a great deal more of racquet-breaking, arguing with umps and swearing on court than Nadal. But to each his own.
If Rafa passes Roger in the Majors race, the GOAT won't revert to Laver. It'll be the endless conversation between the 2 of them. Laver may be the pre-Open GOAT, but that's it.