Did I understand the bolded sentence well?

Two other passengers, besides the one, were plodding up
the hill by the side of the mail. All three were wrapped to the
cheekbones and over the ears, and wore jack-boots. Not one
of the three could have said, from anything he saw, what
either of the other two was like; and each was hidden under
almost as many wrappers from the eyes of the mind, as from
the eyes of the body, of his two companions. In those days,
travellers were very shy of being confidential on a short notice,
for anybody on the road might be a robber or in league
with robbers. As to the latter, when every posting-house and
ale-house could produce somebody in "the Captain's" pay,
ranging from the landlord to the lowest stable non-descript,
it was the likeliest thing upon the cards. So the guard of the
Dover mail thought to himself, that Friday night in November,
one thousand seven hundred and seventy-five, lumbering up Shooter's Hill,
as he stood on his own particular perch behind the mail, beating his feet,
and keeping an eye and ahand on the arm-chest before him, where a loaded
blunderbuss lay at the top of six or eight loaded horse-pistols, deposited
on a substratum of cutlass.


As to the latter possibility, when every posting-house and ale-house could produce a wanted criminal as wanted by the authorities as the Captain, a criminal that could happen to be anything from the landlord to the lowest stable non-descript, it was certainly the most likely thing.