Originally posted by HulkIsHulk
I wish people would stop using Civil War fights for comparison and just look at raw strength feats - because in Civil War power levels flip flop between fights, or even within the same fight
For example, in the first Bucky vs Panther fight. Bucky is struggling to hold back Panther's arm with his metal arm but he is able to do the same thing with his normal arm despite his metal arm being supposedly stronger. You could chalk that up to position. Then when they fight again, T'challa with suit pries the metal arm off his throat, and even without the suit, shakes off a punch from the metal arm, ignores a punch from Buck's normal arm and armbars the metal arm. BP also utterly demolishes Bucky in H2H. And Bucky has been shown to be pretty even with Cap with the metal arm being stronger. So we would expect a fight betweet Cap and BP would be in Panther's favor. Then what happens? They grapple equally and Cap beats him down while fending off War Machine
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The suit seems capable of counteracting the metal arm. It happens twice during the film, as you pointed out, which suggests it is not just down to strength. Because Bucky's metal arm was powering out of BP's armbar (you can see his arm rising, even though T'Challa was using both his own arms, and had leverage) when he was not in his suit, and T'Challa realised it, which is why he chose to send them tumbling down the stairs. And during that encounter, they seemed pretty even overall, even though Bucky's priority was escaping to the roof, not fighting (Bucky got the better of the first exchange and BP the better of the second).
When he fought a suited up BP, he was not fighting to kill, unlike T'Challa. He was trying to explain himself. And he had no gear, whereas T'Challa was kitted out in full vibranium armour (which gives BP a massive durability edge). T'Challa also had no real interest in fighting Cap. He just wanted him out of the way. He was flat out trying to murder Bucky. And Cap had his shield as well. Whatever advantage Bucky's arm normally grants him was shown to be effectively nullified by BP's suit.
So, those particular fights aren't actually that bad if you take everything into consideration. The Spiderman battle was PIS though, IMO. And Tony's Civil War suit was pretty weak compared to previous models.