With intel, I imagine the fight would go something like this. Minato would start of throwing 20-30 Kunai and Sasuke would destroy 90% with summoning shurikens from his wrist and running ration through them.
Sasuke would push the fight to Minato by attcking him with chidor Katana and Enton sword, forcing Minato to use Harashin mostly for dodging and defensive maneuvers.
Sasuke would eventually shorten the battlefield by spreading Amaterasu all over. Probably making Minato counter attacks less likely to happen. It would essentially comes down to who get touch first..
Not sure if Minato should have guy feats, facing a opponent of this level without eye contact.
Sasuke can only run Raiton through as many Shuriken as he can throw at once, and Minato can throw far more Kunai than he can throw Shuriken as shown against his fight against Ay. So he'd cut a few Kunai but the rest would reach Sasuke's general area and then Minato would teleport to him and one shot with Rasengan.
And your scenario doesn't happen anyway, because why would Minato have to focus on dodging and defensive maneuvers if Sasuke attacks him with a blade in close combat when Minato can literally dodge and attack in the same move due to being able to teleport wherever he can get his marking, and getting his marking near Sasuke while they are in close combat won't be too hard.
Gai's fighting style is completely different. Minato can teleport away from line of sight in an instant. Avoiding eye contact is simple. Gai can't do that because he needs to fight his opponents in close combat at all times nor can he teleport around.
So yeah, Minato destroys him. If Sasuke gets close, he gets raped with Hiraishin. If he tries to fight from long range Hiraishin kills him. Even Kirin is useless due to S/T Barrier and the fact Minato has intel. Scenario 2 is even worse of a stomp. Sasuke has no intel on Hiraishin so he'd engage Minato in CQC, Minato would toss some Kunai at him and then Hiraishin V2 kills him.