I think it might be both not odd and odd -- because after reading your information, in my opinion any grave digging connected to St. Charles Seminary should be looked into.

On the other hand, according to this in 1918 when that photo was taken, 13,000 people died within two months in Philadelphia from the flu, many men were away in the war, and also gravediggers were sick.

This source says St. Charles Seminary students dug together with inmates, I think that may be the group depicted in the photo you linked:

Prisoners from the House of Correction team up with seminarians from St. Charles Seminary to dig graves, as the cemeteries cannot keep up with the demand.

I wonder if any Philadelphia historical societies/clubs/forums can provide you with more information about the photo, such as date, location, how to find out who was buried there, etc. Despite the obvious need for graves, it still strikes me as suspicious.

From a quick internet search on Philadelphia influenza pandemic mass graves, I couldn't find anything but mentions that there have been "rumours" of area locations of unmarked mass graves from that time, and that people occasionally accidentally come across them. All very sad.

Please let us know if you find out anything about that photo.

There is a lot of history of Catholic abuse of children, all types of abuse. It seems to be common. They've murdered all sorts of children over the years, including massive numbers of first nations kids. Pregnant young girls were also often sent away, abused, their babies taken from them.

This is the closest thing I could find of Cardinal Kole's funeral video. If it does exist it allows you to insert where you are and to find a copy near you. That is what I assume. https://www.worldcat.org/title/funeral-mass-of-john-cardinal-krol-cathedral-basilica-of-ss-peter-paul-philadelphia-pa-march-8-1996/oclc/52169180