What other reasons do they need to make it compelling. We have a 4 year old child now...we lodged the application in 2013. He was failed refugee and returned to his home country. No criminal convictions.
Hi, without knowing his complete history in Canada one can guess that he may have had criminal charges that were stayed for his removal, or he may have gone underground and did not appear for reporting or removal from Canada. Usually this can be overcome but no one here knows what sort of detrimental information that there might.
I don't know if Visa offices still seek comments from the removal officer, but was he escorted back to his country by CBSA Officers, was he the sort of fellow (back then) who shoots his mouth off while handcuffed in the back of a van (really annoying to enforcement officers). Did he resist removal?
Sometimes an opinion is fashioned that the person concerned demonstrates such a lack of respect for the laws of Canada that the Canadian spouse will have to move to his country, if it's a genuine marriage.
Maybe there are things that he hasn't shared with you, or perhaps he's gotten into some troubles in his home country? People can guess all day.