Assuming they have some responsibility for financial accounting information, that would increase inherent risk – i.e. the risk of misstatements arising.
Control risk is based on an assessment of control activities, only some of which depend on activities carried out by a number of individuals. It cannot depend on on one individual, otherwise there would be a lack of segregation of duties that would most like mean control risk is high anyway, and it can’t be any higher than 100%(!)