Uh, just to clarify but it was my intention to have Alex be around Michelle's area, who I assume is still some distance away from Charlotte, Lee, and Jagred. And the opposite direction Charlotte would want to travel if trying to help Jagred. Or she'd have overshot Jagred by quite a bit. 

But whatever, that's only my mental map of what's going on and what everyone's positions are.

As for the weird stat sure. I suppose it could just be stuff like being unnaturally hard for the Walkers to notice, or perhaps being stronger the more in the immediate vicinity. Explain it as the dormant virus nonetheless continuing to mutate and side effects as a result.