Rodes had standing orders for skirmishers, but it is obvious that those such as Iverson ignored at Gettysburg, it was not Rodes finest hour, but he received little help from his brigade commanders. Unfortunately, his papers were destroyed after his death (Winchester), so we cannot hear from him.
I disagree with you on the identity of these poor souls, uniform requisitions and diaries will help and the two in question are accoutered with new uniforms and federal gear. Being on the Alsop Farm is a huge clue and we do not need the Southern records, but the Federal records, letters and diaries. There are only 9 bodies to be buried, in this picture, with two individuals identically uniformed, so if these were the only Confederates buried here, we have already identified them. The stumbling block is to find out if these are the only Confederates buried at Alsops. I have read that from 9 to 60 were buried in the surrounds.
What is puzzling is the lack of detail, in the Heavies Histories, regarding their baptism of fire and subsequent duties post battle. I am slowly going through bibliographies and looking at diaries and letters as available. I believe we have a 50-50 chance of identifying these two.
The Federals would gather their dead and bury together in a mass grave, with identification as possible, for later reinterment and if previous indications such as Sharpsburg and Gettysburg are the norm, Confederates were buried close to where they fell. The dead from the 1st MA HA were collected and buried at Alsop as were those of the NY and ME, according to records diaries and histories, in fact the 1st MA are identified as the burial group at Alsop, through one of the photographs. They fought a mile away at the Harris property.