Lagna lord is always +ve and yogakaraka per any branch of astrology and probably the most important planet. Creating doubt and fear in mind of people is against principles of astrology. For a couple in love, longevity/career/happiness is seen and logical analysis of nature should be done so people can better understand each other’s behavior and adapt.
Debapratim: best time for marriage will be from mid-2018 onwards.
Good luck and may god bless you,