Maybe but I think the foam piece in front along with the fan shroud is what directing the airflow. The 100 series don’t have all this and it has one of the best cooling system.
I won't make a difference until it makes a difference in the right conditions. There are those that have experienced the overheating first hand. The seal is important to keep hot underhold air from recirculating back to the front of the radiator. At speed, it makes sure the air doesn't bypass and gets forced through the radiator.
The 100-series is setup different but it surely has this seal too. It's just done with out covers. Seal is on the hood and closes tightly against the top radiator support. I can't find a quick pic but this is why every 100-series top rail shows a witness mark of the seal