Why on earth would the father "give the guns back"? Was he still living in Illinois when he "got them back"? Were they given to before he went to TN or afterward? He lived in an apartment in the area, right? Did he have a weapons license in TN?
Did the FBI not keep an eye on where this kid was residing? Like Nick Cruz? Hmmmmmmm?
How long do you think it will take before footage from the cameras in the (every) WaHo to surface?