You can fabricate the fatigue narrative because it's all you do, but it wouldn't justify why Nadal's forehand looked utterly superior,
Lol.....you would call that fabrication, because you are too obtuse to realize the importance of fitness and when someone is clearly energized and/or tired. Delpo has never been the most durable guy or the best at recovering after long matches. The Federer match was very intense and it was also one I do not think Delpo himself expected to win. If I recall correctly, it finished well after midnight and the third set tiebreak was very long.
Djokovic or Gnatal would be able to recover no problem from that with 1 day of rest but they are not everyone on tour - a reality that does not seem to dawn on you when it comes to fitness. The reason you blow that reality off is that you want to excessively glamourize Nadal's game and attribute his success to something higher than just out-lasting opponents.
as it did at the FO the following where he absolutely humiliated Del Potro, and Wimbledon a few weeks after where he produced 42 forehand winners to Del Potro's 32, or Wimbledon 2011 where he just sailed one winner after another 61 to 44 (which says a lot considering how much bigger DP's serve is), or every time they played at Indian Wells...
Goodness fucking gracious.....now you want to talk winners? Seriously?
Do you want to talk about Verdasco hitting 94 to Nadal's 52 in the Australian Open semfinal? Or Gulbis hitting 59 to Nadal's pitiful 13? Or all the matches in which Djokovic has had more FH winners despite supposedly having a worse forehand than Nadal (including, btw, the 2013 US Open final)?
As for your point about Delpo v. Nadal, my main retort to that would be that Delpo's movement on grass leaves a lot to be desired and his backhand is a clear weakness on grass to the point that it ruins his rhythm overall. Nadal knows that, to his credit, and that's why he has pounded away at it at Wimbledon. On hardcourts Delpo has more time to set up his shots. Reflexes and snappy defensive replies on the BH wing are not Delpo's strengths.
But that doesn't change the fact that his forehand is better than Nadal's. You always confuse the forehand itself with everything that leads up to it. If Nadal was to play Berretini at Wimbledon, there would be a good chance that he would hit more winners. Is that because his forehand is better? No, it's because his backhand is better to a point that it would allow him to set up his forehand much more easily.