The inner tube of the fork can rotate in the outer tube, so there shouldn’t be a problem if they rotated. If everything is lined up properly there should be no headshake at speed. The forks may have gotten twisted in the triple tree, which would have the effect of one fork being more forward then the other, which could cause the alignment problem. The only other thing I can think of is that one of the forks got bent, which will be pretty expensive to fix. Hopefully your friend got the guys name and number that caused the accident. If everything is lined up properly one should be able to go down the road at anything over 10 or 20 MPH let go of the handle bars and ride straight down the road all day long like on a 10 speed bicycle (probably dated myself with the 10 speed comment).