minato
naruto
bee
sm kabuto (without kimimaro obviously)
gaara
third raikage
muu
2nd mizukage
orochimaru
Wat the flying f***?
Naruto has a bloodline limit inherited from his mother. It's the reason he has such high chakra reserves and can handle the kyuubi power.
Gaara has a similar thing.
Didn't all the previous kage have special abilities that were exclusive only to them and unobtainable by others?
Also having bijuu powers should be excluded from this too, as it is a haxxed way of becoming Uber-powerful without having any skill or talent at all. Just look at Gaara and Naruto in the early stages of Part 1. The sand and the Kyuubi did everything for them that was worth regarding as amazing in the world of top-class shinobi.
Maybe the same should go for freaks like Orochimaru...
The thing that made Hiruzen so amazing (and in some respects, Minato) was that they didn't have any freak aspects to them or special abilities. They were very much more skill and talent. Even their use of the FTG and the 1000 jutsus Hiruzen knew was something that took a lot of training and skill. I cant say the same for a lot of the people being mentioned, like Naruto, Kabuto. They are characters that manage to haxx their way through the power scale in the anime by getting upgrades from borrowing and stealing other people's powers. It's as bad as Sasuke's power development via the sharingan, Itachi and Orochimaru. Gai seems a great option for here too; hard work. Hanzo too. Sasori, arguably without him being a puppet himself - kinda makes him fall under the category of freak. Kakazu should not be considered as he is definitely under the category of freak. Diedara was a freak... and apparently he stole his clay power...
From what has been stressed and is consistent, Hiruzen was the strongest/most powerful kage and could use the most techniques in the whole shinobi land efficiently, but Minato was the fastest... and that can kind of put them on the same footing.