Too many variables to say all "AO grades would be eligible",
The AO grade may also not be single and may be part of a couple where both partners work and the joint income taken into account may exceed any entitlement even if they have rent and children.
And just like any other line of work in any other industry, many will also not have families and rent to pay.
If you read what i highlighted "all full-time AO grade employees being eligible " you would understand that broad generalisation cannot be true
41% of UC claimants are in employment
https://www.gov.uk/government/statistics/universal-credit-statistics-29-april-2013-to-14-july-2022/universal-credit-statistics-29-april-2013-to-14-july-2022#:~:text=Employment%20rate%20for%20people%20on,who%20are%20out%20of%20work.
Seems a strange...