The horizontal vortices that were so prominent with this tornado may be an indicator of the low-level shear present in the environment or may have been forced at the interface of the tornado inflow layer (lowest 50 m or so) and the air above it. Fascinating stuff.
I typically cringe at those guessing these things prematurely, but I would be very surprised if it's not rated as EF5 based on all available information.
I agree it doesn't matter much for those interested in forecasting, mostly because there's very few forecasting classes in most curriculums, but I think class performance does matter, at least to some extent, in research.
Meteorology is a branch of applied physics. I'm not sure why it would be surprising that you need a lot of calculus and physics to study the subject appropriately.