... No, sorry, can't agree with that. His Rasengan was good, I give him that, but him being able to survive the fight isn't anything special. The others were brought back from the dead after all, so he would have been brought back too if he died.
I don't think he learnt every technique that easily, but I never saw him really train, so I can't say anything about that for sure.
Him being the direct descendant of Hiruzen doesn't mean he would beat Naruto at Sage mode. Obito was an Uchiha and that clan was famous for their strong Sharingan, yet he developed that one really late and immediately afterwards died. So strong heritage doesn't always equal strong children.
Also, sorry but I can't see Konohamaru being able to learn Sage mode. Naruto learnt it after long and hard training for it and he has a lot more chakra and stamina than Konohamaru. Even Jiraiya wasn't able to go completely into Sage mode and he was one of the Sannins.
So sorry but I disagree with your statement. Not saying he's weak, but Naruto is really out of his league.