No, it's wrong... They are more skillful not more powerful. Don't forget that Madara has the Juubi
(almost complete)... Ask yourself this >> Can Naruto and Sasuke surpass the combo Juubi(almost complete)+Shinju? (with Madara too) Of course not. Also, by that logic when Hangoromo became JJ then we would have JJ Hangoromo >>>> Kaguya because he had 10, 20 and 50 at most years to train. But it doesn't work that way. They also don't have the power... Naruto has the body and Sasuke the eyes. They are like Ashura and Indra but more powerful. Dis they surpass the Sage? No. It's the same for Sasuke, Naruto and Madara. Naruto's chakra will only grow not the Rikudo or the tailed beast chakra. Sasuke chakra will never grow to the point where he had some of the
bijuu chakra which is nothing to the full chakra acess the Juubi Jins have. (I meant the chakra that he absorbed is nothing compared to the Juubi Jins). Don't downplay the Juubi and it's Jins who never got the chance to go all out since they were always restricted.