So, let's go surface by surface, as you seem to have some comprehension issues...
* Clay:
Current #1: Nadal, with 53 titles (likely to remain that way for a very long time)
Cap for top 10: 17 titles
Djokovic is #17 with 13 titles. Chances he reaches top 10: very possible, depending on how strong he comes back (needs to win 4).
Federer is #26 with 11 titles. Chances he reaches top 10: nil (needs to win 6, which may not seem like such a big ask, but he's not playing on the surface anymore, so...).
(Which, btw, validates what I and others have been saying for ages, ie that Nadal has had *no* top-level claycourter to contend with since 2015. Zero, nada, zilch, none. The only "true" claycourters on the list are... Ferrer, Almagro, and Robredo, who are about as far removed as can be from ATG's, on this surface or overall. In fact, during his best years on the surface, Nadal's main competition was an everything-bar-clay specialist (yes, Fed would have made top 10 on clay easily without Nadal, but no way he makes top 5, he would never have chased the needed tournaments). So, weakest clay era ever? (And I really do mean "ever", btw--in the Open Era, it's so obvious that it's not even a question.)
* HC:
Current #1: Federer, with 65 titles (likely to remain that way for a very long time, except if Djokovic goes on an absolute tear)
Cap for top 10: 21 titles
Djokovic is #2 with 51 titles (trails Federer by 14), will definitely end in top 10 whatever happens.
Nadal is #14 with 18 titles. Chances he reaches top 10: possible, but not a given by far (needs to win 3, and DelPo is only 2 behind, could end up in front of him). Plus, any half-decent ATG in the future will fly past him anyway.
Grass:
Current #1: Federer, with 17 titles (likely to remain that way for a very long time)
Cap for top 10: 7 titles
Nadal and Djokovic are both tied at #20 with 4 titles. Chances they reach top 10: basically nil for Nadal, may just be possible for Djokovic depending on how strong he comes back (still pretty remote, though).
So, they current standings are:
Federer: 1, 1, and 26 (HC, grass, clay)
Nadal: 1, 14, and 20 (clay, HC, grass)
Djokovic: 2, 17, and 20 (HC, clay, grass)
So, to quote you once again:
"Nadal will be in the top 10 Open era for Hard, Clay and Grass titles won. Probably the same for Djokovic." Sure. And Ferrer is the clay GOAT...
VB: dealing in alternate facts since 2005. No wonder Trumps loves our Rafa...