The League was a different nation than the Caliphate and Castile territories. Most of the League was serfs, whose lives would improve under the Clans. But eliminating the social structure of the League in one fell swoop, only a tiny portion of the population would resist the new status quo. And most of those would be merchants who would find a new and mostly unchanged life in the merchant caste. The biggest change would be the improved and greatly enlarged merchant caste and the resulting political shift in the Clan itself. With Schmidt joining the Clan and quickly rising to a prominent position, there won't be many former Hansa military trying to mount a rebellion. They'd be more likely to follow his lead or obey his order to lay down arms. In my view, resistance of that type would be minimal, since the former serfs would be eager to repay their former masters for generations of abuse and oppression before any serious uprising could form.
I've also previously stated my idea of how the Scorpions would begin any sort of move toward the Inner Sphere. It would be the same as their expansion toward the League before the Crusade. They established colonies, reducing the distance between the nations. That shrinks supply lines and makes transit time shorter between the original territory and the new one. The Scorpions learned how the great distance between the Homeworlds and the Inner Sphere affected the invader Clans, and they would not want to suffer the same fate. Instead, they'd grow the nation physically with those new colonies, including perhaps some former RWR worlds to appease the Seekers. A trading enclave here or there might be an exception, as with the one they acquired in the Chaine Cluster.
In other words, they're not impulsive and consumed with a need to return to the Inner Sphere for any reason. Their territory is large and needs to be secured, with provision made to increase the territory organically rather than spread their forces too thin via establishment of additional, distant territories to defend.
This of course is all my vision. Other writers might crumple that up and toss it in the trash to repeat all the former stuff that happened with the other Clans instead of trying something different.
