So we're assuming Hiruzen would be marked and doesn't know Minato entire arsenal? LOL Clones and Enma stop any and all "blitz" since enma can instantly Create the cage and minato wouldn't see it coming.
Nope. From 20m Minato would get him with Shunshin considering Madara is slower than Tobirama (stated) and almost blitz SM Naruto, whose reactions are >> Hiruzen's, or by tossing a Kunai at him and using Hiraishin. This strategy would work if Minato tries to use Hiraishin, but if he uses Shunshin then forget about it.
How does the Enma cage stop a blitz?
1. Kunai would fit through the holes.
2. Minato would still be able to teleport inside the cage and kill Hiruzen like that.
- Minato isn't a auto sensor, more so passive (as in he has to activate his sensing ability and it isnt all the time ready manga fact)
All he has to do is activate it at the beginning of the fight instead of forgetting to do so like he did against Obito. Regardless, countering sneak attacks from Danzo will not be an issue.
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and when Sasuke noticed him.
- Counter attacking and predicting his FTG isn't impossible. With that logic he is invincible. Also he wouldn't know when a Izanagi kunai stab would come as well.
Obviously it isn't impossible, but considering Danzo and Hiruzen aren't fast enough, you can forget about them predicting and countering it. Obito got blitzed. He's faster than they are. The only people who have ever legit countered a Hiraishin blitz are SM Madara, JJ Madara and JJ Obito.
And yes, he'd know when Izanagi Kunai stab is coming. Outside of chakra sensing, he's going to make some kind of sound that'll get him noticed just like when Minato countered Obito's sneak attack.
Danzo this time has the Sharingan of one of the best uchiha's ever! He will be able to predict and better defend and wouldn't underestimate minato like he did sasuke (because it's fact he wasn't even too worried about sasuke at all).
Based on what again? Danzo gets blitzed and there is nothing he can do about it. Predicting where Minato appears isn't going to let him react to the attack that follows, not to mention it'll be as clear as day that Minato is coming after him anyway, making prediction useless.
Not to mention having Sharingan is irrelevant as Sharingan tracks movement, not instant teleportation. Not to mention if he gets attacked outside of his field of view, Sharingan would be irrelevant even if it could help predict Hiraishin. Unless Danzo somehow became faster than Obito, there is nothing to argue here.
And where did he underestimate Sasuke? The only thing that I recall being stated is that he was saving Shisui's eye for Madara.
Hiruzen has shown great speed feats while in edo to instantly create 5 clones, place them perfectly apart, then instantly counter a jutsu that had already had a head start on him. He will have no problems with base minato's shunshin with the aid of enma.
Speed feat hardly means anything when someone slower than Tobirama, who is slower than Minato on foot can almost blitz SM Naruto from a similar distance, and Hiruzen's reaction speed is not on par with SM Naruto's. So he gets done the same way.
FTg is the only problem, but with clones and Baku the kunais should be rounded up into one spot.
If clones try to round up the Kunai, they get blitzed and killed off in a heartbeat. Baku's suction is countered by Bunta spitting a boatload of oil into it's mouth, or Minato simply teleports out of it's suction range if he has Kunai laid around the battlefield.
No you did not just say Baku is 10x the size of Bunta? WTF?! Did you really just use sasukes v3 susanoo a measuring stone here 
