Neither the Governor, nor the adjutant-general, nor Captain Neal, nor any one back Austin way will ever know who this mysterious leader of the Pecos gang might have been.
"Even out here very few know.

Many supposed, but few knew.

I've shut the mouths of those few.

That blank line in the report is for a supposed and mysterious leader who vanished.

Jack Blome, the reputed leader, and all his lawless associates are dead.