good call on the car people.
I don't think Lori is feeling bad exactly, I think she's feeling "omg what have I done" And now her son is involved.
As to Rick becoming leader, I've been giving this some thought. Remember Shane was clearly leading when rick showed up? I think Rick became the defacto leader because he had been Shane's superior officer on the force and Shane was just deferring to him out of habit and everyone else picked up on it.