On page 19 in the book "Images of Yorkshire Coal" by Peter Williams,
are 5 small drawings. These were in a notebook found in the
pocket of Herbert Cusworth. He had gone down the pit after the 1st
explosion and was recording what he saw. The site of various bodies
& their positions, lamps and their numbers, tubs etc. He must have been
busy collecting this information when he was killed by the second explosion.
Again this doesn't answer any of your questions but adds a bit more to your
overall picture.
Tomkin