I walk barefoot a TON, and wear minimalist shoes when I have shoes.
I think that you can cause problems for yourself if you typically wear shoes with a lot of heel drop, and then you suddenly switch.
But if you walk barefoot frequently, then I don't think that can really "cause" it suddenly.
Rest for awhile, then see a doctor, because I sure as hell am not one.
Rock has relatively short legs comparing to Mac. His handle raises as well albeit not so big as Mac which is understandable because of Rock's smaller #3 Angle.. I do not see nothing bad in handle raising between A1 and A7, it is a perfectly acceptable pattern. Lots of great strikers were handle raisers, btw, and not so much were able to return shaft on the same plane.
I understand your philosophy. When I teach someone I also do not want to change pupil's swing habits over the dead bodies. Yet if I teach a rookie I would like him to work out habits that give best chances for effortless striking which my eyes and brain found in the late Mac's swing.
Snuck a few minutes in the basement earlier before we were cooking turkeys and the like. Then had a go on the sam puttlab. Using he t-stroke and the Mi putting template I got my scores pretty high. The t stroke also feels much more natural at square so I am getting there.