The same reason you can assume that due to the Kin-Gin brothers leaving Tobirama near death by an ambush, means Minato may have the same thing happen to him. At this point it's all speculation, I'm not saying you're wrong in thinking that they may beat Minato (If that is what you think, you may think Minato will win and that they will also do quite a bit of damage on him, not sure your outlook on it)First how can you compare tobirama s/t techn to that of minato's when we dont know how his works U_U
I'm simply saying that right now we know that Minato was highly experienced in S/T techniques to the point of he could do a S/T technique it took three ninja's to do, all by himself, now given that argument, Tobirama can also do a Water Release technique with just one hand seal, when it takes other ninja's a minimum of 44. Not saying Tobirama is not a very skilled ninja, but I do believe he could have taken on the Kin-Gin brothers and been nowhere near death if not for them ambushing him,
-Tobirama wins Due To: He was highly skilled in his affinity and also knew S/T, while being a very good at detecting enemies (Placing one finger on the ground allowed him to tell how many and where at the enemies were) and even created the Impure World Ressurection
But even with those feats, it's not said just how great his reflexes were, all we know is that he was good at S/T techniques to the point of where he had been mentioned by Minato when Minato compared the two of them against Tobi's S/T but then again just by how little we know of Minato, we know more of Tobirama than we do of Minato (If not the same amount)
I believe Minato would win against the two brothers as well (Like I said though I also believe Tobirama would win too)
-Minato wins as well Due To:
Minato's own creation of S/T technique requires a minimum of three ninja's just to replicate the technique, when Minato can do it himself while having an unlimited amount of seals he can place on any object, and even if runs of out kunai and needs to get close to the enemy to mark them, his base speed alone is (By speculation) the same speed as Raikage's V1 armor, and combining such amazing S/T techniques with his own reflexes (The best reflexes in Narutoverse period) allows him to react to any technique the Kin-Gin brothers use, if Darui is smart enough to figure out the flaw to them, Minato definitely is smart enough. Also Minato is great at detecting enemies as well (He can do the same thing Tobirama can) so it's safe to say these two ninja's are very skilled to the point of where they are the two most unbeatable kage's if they are allowed to go all out on the enemy without having to worry about protecting a village or students considering I didn't even list all of their feats and considering we don't know anywhere near all of their feats"
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