See if the time frame fits. Webb ascribes this information to WH Gregg and not Edwards thus I've included his comments about the accuracy of Edwards re Quantrell.

QUANTRELL AND HIS MEN. pg 267 from
W.L. Webb Battles and Biogrphies of Missouri (1903)

raid, and arranged to assist in the extirpation of
the band. There were four men with Quantrell,
and he led them into Walker's house, where they
were all killed. Three of these, according to
Edwards, belonged to the thirty-two above
mentioned.
After this, Quantrell remained in Jackson
County. He assisted Colonel Gill, father of Judge
Turner A. Gill, and Mr. Lipscomb, of Little Santa
Fe, in transporting their negroes to Texas, where
they were out of the reach of the Kansas Jay-
hawkers. Returning from Texas, Quantrell
joined Price's army at Cowskin Prairie, and took
part as a private in the battle of Wilson Creek.
When Price marched against Mulligan at Lexing-
ton, Quantrell came to Jackson County and be-
gan unconsciously the slow and tedious process
of organizing the band which under his leader-
ship became famous. Quantrell was not at the
battle of Lexington, although Edwards gives the
following graphic account of his presence there:
"Mounted on a splendid horse, armed with a
Sharp's carbine and four navy revolvers, for a
uniform a red shirt, and for oriflamme a sweep-
ing black plume, he advanced farthest, fell back
with the last, and was always omnipresent Gen-
eral Price-himself notorious for being superbly
indifferent under fire-remarked his bearing and
caused mention to be made of it most favorable."
Edwards never permits any of his heroes to
suffer for the want of a good word. Edwards was
an advocate, not a judge. He has fallen into
many errors in his history of Quantrell and his
men. Hence I make specific mention of him
wherever I have occasion to use him as authority.
The material for this chapter comes largely from
Captain Wm. H. Gregg, of Kansas City, Mo., a
brave and enterprising soldier, a leader upon
whom Quantrell often imposed the most arduous
duties, and who was always ready and capable.