You’re right. I didn’t even notice the second jeep before. It looks like this was done on purpose, which is kind of stupid, especially on the jeep driving behind the other. The grill is there to protect the radiator from debris. Once the radiator gets hit by a a small rock and starts to leak, which can happen quickly, as they are usually made of very thin metal, you’d have to constantly monitor engine heat and fill up cooling water regularly.