My work injury that caused my problems made me feel very dizzy & spaced out.
I could still drive fine -didn't seem to bother me if I was in a car - but if standing or walking - a wooziness & felt like I was swaying around - really had to focus on where I was and my movements.
I did pass most all of the strength, reflex, grip tests.

Of course this was for a RSI/TOS injury and not PCS, but wanted to say I think it could be possible to pass some of those tests and still have issues.