Dark Angels Rule Question

[kalenein]

I have a question with the Dark Angels Defenders of Humanity rule which basically lets them control an objective even when they are out numbered.

 

I recently played the Mission: Narrow the Search from Chapter approved 2018 and there is a single objective in the mission that works a little different then the standard.

 

My question is in this mission would Defenders of Humanity work, for the instance of controlling an objective if the Dark Angels were outnumbered? 

 

If this is the wrong place for this question I apologies, I just thought it was more Dark Angels specific.

[Berzul]

If I am correct, the rule is about the hierarchical structure of objective holders.

 

Troops can hold objectives over any other unit, despite being outnumbered.

To take an objective from a troop type unit, you need a troop type unit of greater size