I say:
Barry's whereabouts throughout most of his life are unproven
Stanley's death is unproven
Stanley's Obama marriage is unproven
Stanley's kinship to Barry is unproven
Barry's birth is actually unproven
Why suspect him of criminal anything?
Searching for “Stan Dunham”, I find both his mom’s (and granfather’s) Social Security record of death: http://www.legacy.com/ns/obitfinder/ssdi-search.aspx?daterange=1990-1999&firstname=stan&lastname=dunham&keyword=&countryid=1&stateid=0&affiliateid=-1
Serching “Made Dunham” I find reocrd of same for his grannie: http://www.legacy.com/ns/obitfinder/ssdi-search.aspx?daterange=2000-2009&firstname=made&lastname=dunham&keyword=&countryid=1&stateid=0&affiliateid=-1
The other things you mentioned, I am not so sure about.