While ratings for tornadoes are fun for speculation, I take them less seriously than hurricane ratings since it is purely damage based. And also ever since the el Reno tornado was not upgraded based upon in situ Doppler estimates just because it did not produce EF-5 damage. Judging from the damage pictures it's likely the tornado was anywhere between EF3 and EF5, likely oscillating in strength very frequently as it moved along it's path
When people see houses wiped clean they freak, but most don't understand how easy it is for 140 mph wind with extreme upward motion to remove A small wood frame structure from it's foundation. Woods lack of rigidity hurts with tornados, where In earthquakes it actually helps.