Nadal doesn't really have an era like Djokovic does. Before Djokovic began his ascension, he was 8 Slams behind Nadal and 16 behind Federer. Since that time he is within 2 of each. He has won 6/10 Slams since the middle of 2018 which is why this is still his era. He has won 17 Slams since January 2011, while Nadal won 11, Federer won 4, and Murray and Wawrinka won 3. All great players but Djokovic has been the leader for 10 years. He is something like 44-22 against Fedal in that timeframe, held all the Slams, won all Masters multiple times, more then 300 weeks at #1, 6 YE #1 and 3 other times finished #2, etc. so to say those players all have arguments and Djokovic doesn't is ludicrous.