Zimmerman's nose looked nice and straight, no blood - ANYWHERE, no crookedness, no nothing.

What about the wet shirt all covered with grass? Didn't see anything. Didn't see any fabric of his clothing that looked wet or messed up. Where was this? Was the grass just mowed and the clippings not carried away? You'd have stray blades of grass loosening and shedding off him here and there all over the place. None. Where were signs of scuffle on him. Nothing disheveled in the least! Why would he be able to walk upright and with a regular, normal gait after having been in a scuffle like the kind that's been described - wouldn't he be limping a little, or walking with some delicacy? Or maybe a bit bent over or favoring one side or other? Hell, a single workout at my old kickboxing class routinely left me a hobbling pile of wreckage afterwards! Zimmerman looked like he was strolling over to get a cup of coffee across the street.

Seemed pretty damn clear to me, looking carefully at the video I saw. And yeah, there's nothing on the back of his head but what little hair was left after a buzz cut. Seems to me with extremely short hair, you'd be able to see signs of injury, scuffs, cuts, blood - no longer hair present to conceal it.