I said I'd do a long time ago, but lost interests when it was revealed that it wasn't his own power.
Oscar did that by using the energy stored within Long Memory, which means this isn't a feat for Oscar that'd lead to any upgrades. At best it'd scale to his shield, since he was shown using the shield before getting hitting the floor. Assuming Long Memory energy release is always an explosion, and can't be released in other ways.
However they already have a higher 7-C possibly rating via Ozpin's shield. So this would be like priority 4, doesn't do anything but offer support to current ratings.
Also 8 Kilotons is 7-C, not Low 7-C.
Edit: There is also the question of Ozpin/Oscar not producing the barrier with their own magic, but with the energy inside of Long Memory.