Hard to say if you will find confirmation of a call-up in his file. I've only seen an indication a handful of times (I've researched well over 100 files, though many were earlier enlistees) and it seems to have depended on the interviewer to make note of it. I would expect those forms to be included in the genealogy package but it's my impression not every file has them. Processes changed through the war, so there is no 'standard' file.
Complete file will generally get you a lot of medical and dental records and stuff related to settling his estate. In most cases it's extra $ for no useful information, but it ensures you have exhausted that avenue if there is something you are looking for. Info on the nature/circumstances of wounds (generally not there for those Killed in Action) and clues to place a man in a Company within his unit are the kinds of things I recommend the complete file for. Other correspondence from family etc. sometimes shows up.
Don't recall if you've mentioned a photo elsewhere. They are almost never found in an Army personnel file, so I would suspect if you have one it was done privately. If there is one in his file, you might need to have a researcher on site flag it for reproduction. LAC is generally not keen to dig through files for a particular item.
Not sure on your 0 results question. The only link I see under option 4 is to the First World War database?
If you haven't already, I would definitely try the RWR Museum. They have transcribed a lot of Battalion Orders etc. and might be able to provide a bit more, especially which Coy he was in. If you can narrow that down, the RWR War Diary has some very good Coy level accounts of D-Day.