You're absolutely right about that part of it. The Chiefs prepared so much for the new rule that the Chiefs players even understood that the game wouldn't end on their possession at the end of the first OT period.

Knowing every nuance of the rule effects everything.....player decisions, playcalling, ect.

So from that standpoint.....Shanahan dropped the ball. Even if he knew all of this....not going over it with his team in detail was a pretty bad look.

You gotta think every team goes over this EXTENSIVELY this summer if they haven't already.