It’s not about the weak becoming strong it’s about them finding strength in their weakness. Which means that their very nature of being weak actually makes them strong. You can see how weakness brings a family together. A helpless little just born would bring the family together or an old grandmother who relies on others to get up and walk and to survive can also bind the family together.
So what makes these people who are totally reliant on others become strong in their weakness? Homo Sapiens were at the bottom of the food chain or probably in the middle. They were in no position to take on the predators but then they did. Homo Sapiens were perhaps only species that produced babies that were semi-formed who needed care and protection. So perhaps the stronger members of the family took turns to protect the babies. These helpless offspring brought the tribe together to protect the smaller ones.
This protecting the weak the vulnerable plays out even now in many situations. I would take the coalition politics as a case out here.
The political firmament has a variety of political parties in India. Over the past 5 years, we have witnessed the rise of one and the fall of the other.
A power that is the outcome of vulnerability can be magical. It has the power to bring various forces (even opposing ones) together. And the power that springs forth from might is predatory it may weaken the enemies but remember it is the weakness that will make them strong in their weakness.
Tilted Plus 
This is great.