I'm a psychologist and it makes sense to me. People have cognitive paradigm's of what they think certain people look like, they group them to what is their norm. For all the people he may have seen that night (especially if he was a bouncer or security of some kind), not knowing what was significant at the time, it makes perfect sense. A big black guy may have dreads, but he's not paying attention to them so by morning, the brain kind of buckets that info into what you're cognitive paradigm looks like for "black guys" and maybe to him, his memory is then someone that looks like Shug Knight. It's a weird thing and yeah, it seems like he should have been able to do a better description but beyond that, LE has indicated that WG is of no concern but a witness (they must have reason to think this) and even after the time of what he saw, there is video showing JM with her and then they're at Tempo together...so no reason to think that the bald/dreads thing is any more than just an explainable memory fog. The FBI is on this too, remember that. They have experts in this area and are probably advising LE to not worry about that discrepancy.