Is it really a surprise that Minato is left for last? He has the biggest revelation of all....
No one knows that among these guys that Tobi was behind the Kyuubi attack 16 years ago.
Hiruzen couldnt get to Minato to talk / vice versa
Sasuke doesnt know / didnt believe it was the case because everything Obito said about Itachi turned out to be true so he believed Obito's words on the kyuubi incident as well
Obito being behind the kyuubi attack should change everything.
-Hiruzen would realise the Uchiha were indeed innocent thus would feel bad
-Sasuke would realise that yes the Uchiha were innocent (as he believed they were) but that the village didnt suspect them for no reason, there truly was a Sharingan behind the scene controlling Kyuubi
This should make Sasuke realise that Obito really is to blame for this... and with Orochimaru everything through Kabuto, he could reveal that Madara wasnt just revived but actually lived far passed his Hashirama fight and actually is the mastermind behind all of this as Kabuto knew that Tobi and Madara were working together.
Sasuke learning that Madara has some connection with Tobi, the man who cause the Uchiha's downfall, could potentially make Sasuke want to finally redirect his revenge towards the right targets, Obito and Madara.
Sorry for the triple post :s but this nailed everything.
Tobirama may also feel guilty knowing the truth of the Uchiha Massacre after saying they had it coming,
only thing is, after hearing Minato story, and clashing against Madara & obito, what I'm thinking is that the Kages won't be able to beat Madara, but Naruto & Sasuke will, as Naruto wants to be strongest Hokage, he will do that on Battlefield alongside Sasuke, showing that both of them have surpassed the past Legendary shinobis, i guess everyone should of seen that coming, knowing this series always illustrates that new gen always surpass old gen. And who more worthy of surpassing Hashirama and current Madara other than Naruto and Sasuke?

IMO, sasuke might get a power-up after Minato's story, his hatred will increase a lot more than before knowing his obito, an Uchiha himself started the assassination of his own clan. + IMO Madara I think didn't want his clan killed, even after they never trusted him, he still cared for them.
But once they are gone he will most likely target the leaf for what they put Itachi through. He won't probably destroy the leaf but he will try and kill the elders. That reason alone, naruto vs sasuke will occur which should be the final battle of the whole series.Quite sad really, knowing that the naruto anime is going to finish soon, end of the war is coming + final Naruto vs Sasuke = End of the Naruto. Maybe at the end of series, Kishi does a 20 years later and we Naruto & Sasuke + Konoha 11's kids

that would be amazing