I think the guy on the radio (sicko1) and the creepy guy (sicko2) at the fence are two different groups. Sicko1 is in an elevated position like in the penthouse of a high rise building since he's able to see movement below like Lee's group and the walkers. He has no reason to get a closer look at the backyard of the house he saw Lee's group run into. Sicko2 heard all the gun fire, commotion and attempted break in of the house and came to investigate. He ran away since he thought Lee's group was most likely from Crawford just like Molly concluded.
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