We've gotten a silly but important question for you.
Yesterday we played poker and after one of us won and took All the pot, we discover that one of the A cards was out out of the card's packet, and wasn't in play at all (during all of our hands).
This discovery started a massive debate immediately. On the one hand, some of as argue that the game was corrupted and that the result is not legite. On the other hand, the winner argued that all of us had a fair chance to win since no one knew about the A disappearance.

What do you say? Who is right? Is the result legite?