The only family information I know is what I have read in all the threads of your inquiry. He was not buried in the Aisne-Marne Cemetery. That was not built until the 1920's when the families were notified of the options for burial. If he was buried in any US overseas Cemetery he should be listed on the ABMC website. Contact the ABMC headquarters to see if they have any other information. WWW.ABMC.gov
Review all the existing written documentation you have regarding his immigration and draft registration.
The Lt Colonel is probably not your ancestor - he lived beyond the war.