Found one gap. Death for George WALKER.
1933 NSW Electoral Roll - South Sydney - Marboura North
WALKER George, Elmston, 307 Botany street, horse trainer
WALKER Maria Frances, 307 Botany street, home duties
WALKER Esther Elizabeth, 307 Botany street, dressmaker
WALKER Laure Gertrude, 307 Botany street, nurse
Death 23408/1936 WALKER MARIA FRANCES - SPENCER 63 YRS KINGSFORD KINGSFORD
The Sydney Morning Herald - Friday 30 October 1936 p.11
FUNERALS
WALKER.-The Relatives and Friends of the FAMILY of the late MARIA FRANCES WALKER are kindly invited to attend her Funeral, to leave her late residence, 307 Botany-street, South Kensington, THIS FRIDAY, after a service which will commence at 2.15 p.m., for the Church of England Cemetery, Botany.
CHARLES KINSELA, Funeral Director, Oxford-st, Taylor Square, Darlinghurst.
George is not mentioned in that notice so perhaps this one:
18712/1933 WALKER GEORGE - WILLIAM - MARY A - RANDWICK
Not in Ryerson.
I can't find any record where he has a middle name.