Looking at A, every people have the same problem. If anyone is to be blame for the STP crises is Senator Mee. She had the torch and she didn't plan for her replacement. She had 10yrs to organize a Hmong coaltion and she did not. A was not planned. We need to think bigger than outselves. What a waste of opportunity.
Again, you have the cart before the horse in your analysis. Succession planning would not matter because Mee Moua did not have 100% support from the Hmong. I estimate Mee Moua might have had about at most 40% support (in general TC). If you have read the news articles, she had woman against her, she had old traditionals against her, and etc... She had so many enemies. Mee Moua never fully consolidated the influence of Hmong within her sphere. She had a minority support at best. Her hand pick successor would not have faired well due to the seperation of Hmong votes. It is the seperation of Hmong votes that lost the Hmong the influence at the capital. Hmong have yet changed their mentality - too many chiefs.
You should read the FEDS and scholary analysis of the SE Asian...and on Hmong. They wrote that our people had a chieftan problem...that is our true achilles heel...One can say it's the last name as pointed out by the OP, but it is not...no matter what last name, it'll be a society instead of a clan or an ethnic group.