To be honest, from the various footage I saw on NBC and other news sites, that week, I'm not suprised at it being upgraded to a low end EF-4, because when I had looked at alot of the damage from various pics, from the various news sites and other video clips, etc, I had a gut feeling that the tornado was a little stronger than they probably be aware of, untill a more detailed investigation of the exact damage and secondary damage done.
Reguardless of the tornado rating(s) though, it can't bring back those who were killed by the tornadoes, and my respects and sympathies go to the families of all those people who died that day.
Willie