^Agree. A gun on his hand doesn't fit too well for a superhero like him either. A normal soldier can shoot enemies just as good. There's no "super" on that. Cap needs to throw his shield more and catch it like he knows where and when it will be to add some effect.
Yeah Stark and Cap would be like Zoro and Sanji. Thor would be more amused rather than offended by Stark's antics and Bruce Banner would be all nice to him but would love to chop his head off once he turns to the Hulk.
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