The players who said they didn't know the rules had no impact on the game and while they were asked and answered, nobody used it as an excuse.
Kyle took the ball because their analytics team decided that they wanted the 3rd possession...IE if 1st team scores, 2nd team matches, then 3rd possession is sudden death. It came out that KC likely would have gone for 2 in that case which would make the 3rd possession moot, but no way to know that in advance.
It wasn't a lack of not knowing the rule. We can debate which way is "correct", but they made that choice and have to live with it. If they get a block on that third down where Aiyuk was wide open in the endzone, they game might have been decided on 2 point conversion attempt. Who knows. That's not what happened. Just have to own it and move on.