midsurface gap

Some screenshots to understand your question ?

Please see

I mean your screenshot or your model!

Can you explain the following questions regarding the above video:

what is the projection direction for rerun option for selected lines? It is mentioned in the video that additional  lines have to be selected to create a surface which is not clear. 

what  rule  HyperMesh uses in order to select corresponding collapsed line for refilling the gap areas? If you select an enclosed line does it mean that it will project the surface with in the lines onto the gap area?

 Can plate edit options in the midsurface panel (e.g. transition surface , plate edge, etc. when extracting midsurface) be used to fill gap areas. Please mention some references for further study.

As an example: why lines inside red circles have to be collapsed in order to close the gap? Why not only choose lines in blue circles?

<?xml version="1.0" encoding="UTF-8"?>

Try to play with extraction options (see screenshot)

<?xml version="1.0" encoding="UTF-8"?>

The given answer didn't help that much. I was wondering if someone can answer more relevantly.