This is the written gov't POLICY regarding access to seriously classified info.
Per that policy, his access "should" have been denied.
when did God die and leave you in charge.
It is not "my opinion" but the view of the panel of the National Academy of Sciences.
And my personal opinion is that you have a loathsome susceptibility to scientific humbuggery. Given that view I will henceforth discount the credibility of any position you post here.
There is an awful lot about the security clearance process that you are woefully ignorant of.