According to a reference of Confederate Staff Officers 1861-1865
The only Officer with rank of Lt in the Engineers on E. Kirby Smith staff March 1865
was p.78:

"Hodges, H.K. Lieut, act. Chief engr. District of Arkansas, staff of Gen. E. Kirby Smith, March 1865"

https://books.google.com/books?id=u-ZYAAAAMAAJ&pg=PA67&dq=Kirby+Smiths+staff+officers&hl=en&sa=X&ved=0ahUKEwiG6qLtvP_fAhUvTd8KHY2wBE8Q6AEIMDAB#v=snippet&q=%20E.Kirby%20Smith&f=false