Many who have the stronger cases, are very organized and have tons of evidence seem to be the ones who worry the most I find. You have to consider that some are applying with an arranged marriage not having spent time together before marriage (for religious/cultural reasons or due to distance) and return to Canada soon after getting married. Some had only met for the first time in person on the same visit as their marriage. Your spouse also didn’t apply for SOWP and applied for a closed work permit based on his own skills and education.
