That looks good to me.
additional Information:
The 8th Missouri Inf. was commanded by Col. Charles S. Mitchell, and the 9th Missouri was commanded By Col. John B. Clark Jr. Frost's Brigade also contained (Major?) Richard Musser's 8th Missouri Battalion which was later, after the Battle of Little Rock, consolidated with Mitchell's 8th Missouri.
And Capt Ethann Pindall in his diary does refer to White/Ponder's Missouri Infantry regiment as the 12th Missouri Infantry.