Lol. This is where the tennis reasoning leads to.
For example, Nadal had good competition vs Roger and Novak in RG final. He did beat them sometimes easily but that doesn't mean he had no competition. He was better than his best competition by a long shot. Roger and Novak were very formidable on clay and Nadal had to beat 1 or the other for 9 out of his 12 RG. And outside of RG, Nadal had to beat Roger/Novak 13 time to the slam title.
Same way, just because Nadal beat Novak and Roger on their best surface doesn't mean they didn't have good competition. They had Nadal to contend with. Roger had to beat Nadal/Djokovic 7 times to the slam title, and Novak had to beat Roger/Rafa 13 times to the slam title.
Just proves Nadal and Djokovic had faced other big 3 more times than Roger did.
Now look at some of the matches.
Federer/Djokovic AO07 - No chance Djokovic but its still counted
Djokovic/Federer AO18 - Almost injured Federer so no chance but its still counted
We can give Rafa a little brownie points because out of those 13 times, he always beat good/great either Federer/Djokovic. But out of those 13, 9 are on his beloved clay.
So no, Nadal didn't face toughest competition. He and Novak faced similar in their career. Roger did face easier in his early days but that caught up to him in his late career when he was old and had to beat 1 or 2 of them.
"He had to deal with Federer during the 2004 to 2009 period, an ATG during the height of his powers, and then had to deal with Djokovic from 2011 to 2016 period, another ATG during the height of his powers also." And this makes not much sense. 2004-2009 Federer was at height of his power but not best on clay, and 2011-16 Djokovic was at height of his power but not on clay. Most of the matches Rafa had with them are on clay so that neutralizes everything. If you are talking about ranking points, then yes, having great game on multiple surfaces and being comparatively very bad on clay doesn't make a lot of difference in 12 month period than having great game on all surfaces. Clay being second most frequent surface can do just limited. Similarly, if one were pure grass specialist and comparatively bad on other surface, they would probably not even reach top ranking. Roger and Novak are better on more frequent surfaces and so have more domination and weeks at no1.