Yes, I remember that soldier from the 5th Louisiana. Also I know that Missouri soldiers were sent to the Sulphur Springs Hospital not only from Parsons command but from other Missouri Unit east of the Mississippi. There are also indications that the crossings of the Mississippi River at Gaines Landing was quite a military operation that has gone largely undiscovered. But again finding some sort of records is near impossible.
From the correspondence of such noteable personages as President Jefferson Davis, and area commanders like Major Gen. Joseph E. Johnson, Braxton Bragg, and Theophilus Holmes, I am positive that The lower Arkansas River Valley and thereby Pine Bluff and Sulphur Springs was a much Larger behind the scenes player in the National Stage of events, especially regarding U.S. Grant and the Eastern Mississippi and Vicksburg Campaign, than most historians are aware of. Arkansas Post, as singluary important as that location and Battle was to the Confederacy, it was only a part of the overall planning to counter Grant's operations. In other words unlike most seem to think, the Confederates didn't put all their eggs in that one basket. The people at the Vicksburg National Military park started to see some of this during their Vicksburg Campaign study back in 2000-2003.
Bruce Catton in his time honor books comes close to acknowledging this, but at the time he wrote his books I don't believe that he quite had all the pieces. That's the really puzzling thing, most of the original source materials have most of this. But because many of the places were misidentified there were some wrong conclusion arrived at by later historians and writters and a large part of the story because lost, like Sulphur Springs. Just the job of going back and restuding and evaluating all the original letter and journals and other primary source materials is so massive after all of this time that I don't believe that I am going to be able to do it all and discover all that there is yet to uncover.
It's not exciting research, it's is not about grand battles and flanking movements of whole armies, and that is what turns a lot of people off from wasting their time in studing it. It is "Nuts and Bolts" research. Getting down in the trenches and getting dirty. It more about the game of Chess, than it is about grand Generals. And I have already forgotten more than I will find in the future.