The 5 feet thing has never made sense to me. Not that I don't think it's possible that was as far as they came into the house, but that you could say that as if it were fact. I never understood the assumption that somehow just walking anywhere leaves some sort of footprints. That makes no sense to me. It was dry out and hadn't rained in a while. As long as you don't step in blood, or if you were an accomplice that entered from the patio or garage, I don't see why there would be magical dry footprints left anywhere.
And if there were dirt or leaf bits... so what? What does that actually tell us? Besides, it doesn't appear to me as if this was necessarily the cleanest home in town, ready for a Better Homes & Gardens cover. My point being, it's not at all far-fetched that the perp and/or an accomplice ventured further into that house. I dunno... just rambling out loud...