I have yet to see it explained why there is no space at the top of the head between the front of the body and the back of the body...
Simple, really.
The burial cloth was one long piece, 14' 3" long. = His body was laid on the bottom length and the rest was drawn up over his head and down the front.
Therefore, there was no 'space' - it touched the head at every point.
All information - a plethora of research and documentation - is available online. It continues to amaze me at how many folk opine without doing research...