I know nothing about Dublin but this 537 page pdf reveals quite a few options options. Am sifting through for those buried in Dean's Grange in winter month's in the late 20's and 30s and getting a long write up to justify the crowd.
http://www.irishspiritans.ie/spiritan_author_doc/fr_sean_farragher/irish_spiritans_remembered.pdfBRENNAN, Fr Nicholas 1854-1928 - Former Dean of Blackrock college (could explain the boys at the back of the procession)
Fr Nicholas J. Brennan died 4th October 1928 aged 74 years and was buried in Dean’s Grange.
HYLAND, Fr Michael J. 1848-1930
Fr Michael Hyland, who could lay claim to be one of the best known ‘characters’ of the Irish Province for some fifty years died 14 October 1930 aged 82 years. He was buried in Dean’s Grange.
BUNBURY, Br Achilles (Thomas) 1848-1924
Br Achilles Bunbury died 31 December 1924 aged 75 years. He was buried in Dean’s Grange.
CREHAN, Fr Edward 1861-1939
Dr Edward Crehan died 2 January 1939 aged 77 years and was buried in Dean’s Grange. Former Dean of Rockwell
O'BRIEN, Fr Thomas F. 1871-1928
Finally, his large and generous sympathy for the poor and the distressed, was from start to finish, an outstanding trait of his character." Fr Thomas O’Brien died 13 December 1928 aged 57 years. He was buried in Dean’s Grange.
DOWNEY, Fr Michael J 1861-1936
Fr Michael Downey, who had suffered from indifferent health all his life, died 17 November 1936 aged 75 years. He was buried in Dean’s Grange. President of Blackrock
There are some other potentials as well...