IME, these folks are hard to filter out; takes a few weeks/months to figure it out. But, because they are already somehow a CxO and you hired for CxO, then they

IME, these folks are hard to filter out; takes a few weeks/months to figure it out. But, because they are already somehow a CxO and you hired for CxO, then they'll still get considered for their next CxO - cause the short stint where their incompetence was detected will be just a blip - their previous gig was the fail-up that fools you (me, and others I know) and will fool those after you as well.