Question: What was Robert G. Shavers "Official" rank prior to September 24th, 1862?

Robert Shaver returned to Arkansas after being wounded at Shiloh and his 12 month enlistment expired as many other Arkansas Officers did during the Crisis of the summer of 1862. He was almost immediately placed in command of a camp of instruction, and the Post of Pine Bluff in June to August of 1862. Several Telegraphs of the Hindman Copy book in the Alexander Collection are directly addressed to him in command at those posts, during that period. He recieved and executed several military orders and corresponded with higher commands at Little Rock while in command of and organizing a brigade of Arkansas Infantry consisting of the 19th (Dawson's), 24th (Portlocks), 33rd (Grinsteads) and Crawfords battalion.

Did he not retain his rank as Colonel during that time? If so why is his date of rank September 24th, 1862?

I suspect that this information of a date of September 24th, relates only to his appointment to command and organization of the 38th Arkansas Infantry, since Colonel Shavers did not depart from Pine Bluff until September 28th, 1862 at which time he was still in command of that post. The 33rd Arkansas Infantry was dispatched from Pine Bluff on Oct 4th to join Col. Shavers at Litle Rock and accompany him to North Arkansas.
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Copyed from your previous post;

R G. Shaver
Enlisted as a Colonel
Field & Staff AR 38th Infantry
Commissioned September 21, 1862, age 38, born in Tennessee

A letter in his file from the Adjutant General, War Department, dated February 16, 1938

"The records show that R. G. Shaver was appointed Colonel of the 7th Regiment Arkansas Infantry, Confederate States Army, July 26, 1861, age 31 years.
He was not re-elected at reorganization May 14, 1862.
He was appointed Colonel of the 38th Regiment Arkansas Infantry, C.S.A., September 24, 1862, from the State of Arkansas (born in Tennessee) . . . . Residence Lawrence County, Arkansas

Col. Shaver [Col. Robert G. Shaver, commanding 38th AR Inf.]
your friend Bob Caslye ?

Robert G. Shaver
Residence Lawrence County AR;
Enlisted on 6/1/1861 at Lawrence County, AR as a Colonel.
On 6/1/1861 he was commissioned into Field & Staff AR 7th Infantry
born in 1831 in Sullivan County, TN
died 1/13/1915 in Foreman, AR
Buried: Center Rest Cemty, Howard Co. AR
(Wife: Adalaide)