how did hiruzen or oro not live up to their hype?
-> Oro is still alive after going near the entire series with no arms or ninjutsu. That's god damn impressive when you remember just about everyone was after him and he was #1 in the bingo book. Even with feats, with no arms, he shrugged off 4T naruto, Tsunade, nearly solo'd hebi sasuke (if oro tried to kill instead of take over his body, he most likely would win), killed 2 kage one of them being 'god of shinobi' hiruzen by barely lifting a finger, restrained Shinju and spiral zetsu and, again, as stated initially, survived life threatening damage or even straight up death numerous times.
-> Hiruzen busted out 5 elements. That should be enough to prove the hype right there and then... As if that weren't enough, spiral zetsu and his shinshuu senju are still not around. That can only mean one thing, Hiruzen's still solo's Shinshuu's ass. Gokage and Sa are all out of chakra and been getting their ass kicked, taka hauled ass, and the rest of the hokage have been dead. Hiruzen's been the only useful person down that side for the past few chapters. Being able to take on Shinshuu for this long is quite impressive. The guy's showing feats that can already compete with base hashi (those 5 juubi sized attacks). So, yes, he's proving his hype.
-> EMS sasuke... err... The guy has enton and PS. Simple extrapolation basically tells you what he can do; we've already seen a piece of it with him using a massive enton sword with V2 susano'o, and doing some impressive speed feats.
-> One of the 7 swordsmen survived 8th gate dai. Considering what 8th gate guy just did; I'd say those guys are quite reasonably strong.
My list is
1) Sakumo
2) Hanzo
3) Shishui