This would also explain why Hulk fills most of the poster frame and James Rhodes is off to one side in his poster.
This is likely why Black Panther is crouching in his poster, and Shuri is playing with some of her weaponry tech.
However, the fact that Captain America and Bucky aka White Wolf were the two characters that got the same pose was super fitting, considering their shared history.
Personally, I’d just like to point out that Deadpool did it first.