I have to admit to some confusion folks!
The Winipeg Sun has Allison down as the bomb aimer in the crew,as do other posts on this thread, but the Commonwealth War Graves Commission lists him as navigator. Could make crew identification even harder than it already is don't you think?
On Caroline's update thread, the picture of the crew in flying clothing throws up one or two useful points. The man on the extreme right has a badge on his upper left arm. In the other photos this was not very distinct and I took it to be a wireless operator's badge but, move back from your screen a couple of feet and look at it again. Is it my imagination, or could that badge have the word CANADA on it?
The man next to him, I believe, is one of the air-gunners, quite possibly the rear gunner. He would be the one member of the crew most likely to be wearing a full Irving flying suit as this chap is. The fellow second from left seems to be similarly attired, although it is not quite so distinct. If that is the case, then we have found Groulx and Du Sablon.
Now look at the photograph that Caroline found of Allison in formal uniform. Compare it with with the facial features of the man third from right in the crew photo.
Could they not be one and the same person? If so, then the navigator's bag on the ground almost in front of him might well bear out the CWGC listing of Allison as the navigator.
This all contributes nothing to identifying the young man in the original photograph found at the crash site, except that it does confirm that crew members probably wore "CANADA" flashes on their uniform jackets.
Over to you my friends.