Carmody wrote:Trouble is that for me the appearance of Akkadian is definitely not cueniaform
The bulk of cuneiform is written in Akkadian. You only chose one specific example of it, don't generalize your impression over the whole language. In fact, the cuneiform writing in your original post (Xerxes I inscription at Van) contains cuneiform in three languages: Old Persian, Elamite and Babylonian (a later Akkadian dialect).
The cuneiform inscription on the Manishtushu Obelisk (from your post) seems to be written in archaic linear script:
Early cuneiform inscription used simple linear inscriptions, made by using a pointed stylus, sometimes called "linear cuneiform", before the introduction of new wedge-type styluses with their typical wedge-shaped signs. Many of the early dynastic inscriptions, particularly those made on stone, continued to use the linear style as late as circa 2000 BC.
https://en.wikipedia.org/wiki/Cuneiform#Early_Dynastic_cuneiform_(circa_2500_BC)