There is no way the PF didn't feel the drag, no way the Aircraft wasn't shuddering as the Axles dragged across the Tarmac......
What evidence do you have of axles being dragged across the tarmac? Are there any other scrape marks on the tarmac apart from those made by the rims?
If the pilots' bums are sitting over the nosewheels, would there be any detectable vibration from the main gear? There is still some rubber on the wheels, possibly allowing for some cushioning. Also, the aircraft still has pressurised struts for dampening.
Do airplane tyres normally soak up all the vibration from the tarmac?
and all 4 rims dragging.......
Where do you get the idea that the rims are dragging. As stated before, they are probably producing less drag. Trains run on metal wheels. One of the biggest problems train wheels have is getting friction for accelerating and stopping.