More less it is Jaina’s interference making the Horde fight up hill in a blizzard that stopped the Horde and Rastari from reaching Rastakhan in time to provide aid while he was fighting the Alliance raid team. Jaina is also more less responsible for saving the Alliance attack from completely becoming a suicide attack. Not to mention the whole Lord Admiral thing and Kul’tiras and Zandalar being implied to have long term animosity due to being competing Naval powers and House Ashvane trying to exploit the resources and people of Zandalar.
Genn at best on the Horde side of things comes off as just a commander of the Alliance murderhobos that tries to get Rastakhan to surrender.