Wolverine's never serious cut / hurt Black Widow either... doesn't mean he can't.
Piotr and Logan have never had a real fight outside of Helverine (who cut up Colossus like he was made of rice paper), other than that Wolverine has only scored him with glancing blows. If Wolverine ever connected cleanly with Colossus, possessed by demons or otherwise, he'd cleave right through him.
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I'm sure being a class 10 made a huge difference, because as well all know Adamantium's cutting ability is directly proportional to the strength of the wielder. That's why Wolverine routinely fails to do damage with his claws, because he lacks the strength... oh wait... that's not even remotely accurate.
Adamantium weapons have intrinsic armor pen. Anyone who lacks true invulnerability will be damaged by them the same as if they were a regular human.
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Why would it? Armor pen is an innate property of Adamantium, it essentially multiplies the defense of anything it encounters by zero. There is nothing to suggest that there are vary degrees of difficulty when cutting something with an Adamantium weapon. We've seen demonstration on panel dozens of times that Wolverine can stab Gladiator and Mangog just as easily as he does Punisher. What possible difference could a strength bump make at that level? True invulnerability and force fields are the only thing thing that can turn his claws.
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A panel is a single snap shot in time, for all we know his claws continued in after that moment.
Adamantium can cut through virtually anything, and Wolverine has carved up more durable beings than Colossus with minimal effort. Saying a non amped Wolverine can't cut Colossus is absurd, all you can say is that he hasn't... yet.
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Logan might just to get a good shot on him is all. I recall Hellverine's first attack just bounced off him. But then Logan came back with his body on fire and then he was able to cut Colossus iirc.
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