I’m a little shakey on the details but I think it has more to do with the extra bone mass in relation to the way the jaw functions. It acts more like a shock absorbing bumper than a lever.
Other animals that get punched there tend to take that blow more to the throat, which is a bit more problatic
The chin would act as a lever no? The longer the chin the harder your brain is shaken.
I’m a little shakey on the details but I think it has more to do with the extra bone mass in relation to the way the jaw functions. It acts more like a shock absorbing bumper than a lever.
Other animals that get punched there tend to take that blow more to the throat, which is a bit more problatic