The prevailing wisdom on the internet is that you will typically need to wear your hair at a 1 or max 2 to conceal FUE scars. Of course, results may vary from person to person, but this length is typically what is mentioned.
However, if you look at the results in this video at 7:15, the individual has shaved his head down to a 2 and the outline of the FUE scars is clearly visible. This individual was a patient of Dr. Panine, who is a reputable surgeon that gets great results, so I don't think this is the result of a bad surgery.
For people who have had an FUE surgery what guard can you shave your head to without visible results? Are the results in the video atypical? Thank you for any insight!