Alex,
See this link for files related to the correct voyage of the “QE”
https://heritage.canadiana.ca/view/o...623/22?r=0&s=1
Files start at image 22.
Have a look at “Voyage Report” at image 330 for dates which match the known dates for your Great-grandfather.
I got to image 551 but still haven’t found a nominal roll that lists all 15000 passengers.
There are documents which give quantities of RCA pers transiting through Windsor, NS but no names.
I’ll continue to have a look later.